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from英语怎么读

2023-07-23 22:14:43
TAG: from 英语 ro rom
共1条回复
苏萦

from英读音是[fru0259m],美读音是[fru028cm]介词。(表示时间)从…;(表示原因)因为;(表示来源)来自…;(表示分离)与…分离,隔开。

from

英[fru0259m]美[fru0259m]

prep.(表示起始点)从…起,始于;(表示开始的时间)从…开始;(表示由某人发出或给出)寄自,得自

From用法

1.动词+from

a)动词+from

come from来自,date from追溯,depart from违背,die from死于,escape from逃出,fall from自…跌落,hang from垂挂,hear from收到来信,learn from向某人学习,return from自某地返回,rise from自…冒出,result from起因于,suffer from忍受。

b)动词+sth./sb.+from+sth./sb./a place

borrow from向…借,choose from选自,excuse from免除,keep from阻止做,prevent from不准做,protect from不受…之害,receive from收到,remove from移动;除去,save from保全;拯救,separate from分离开来,stop from阻止。

2.be+形容词+from

be absent from缺席,be differentfrom与众不同,be far from更不用说,be hidden from躲避,be made from用…制成,be tired from因…而疲倦。

3.from…to…

from bad to worse每况愈下;from beginning to end自始至终;from cover to cover从头到尾。

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receive是什么意思

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receive的读音

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2023-07-23 19:41:005

山东科技大学在职研究生值得读吗?

值得读。山东科技大学在职研究生的招生方式是专业硕士,学员要在期限内完成报名,报名成功后参加招生考试。考试成绩合格的学员,方可参加该校的课程学习。具体的报考流程如下:首先学员在山东科技大学的招生时间内,登录研招网进行报名,根据报名网页的提示,填写正确的报名信息后提交,并支付报名的费用。其次学员根据报考点指定的时间、地点,参加网报信息的现场确认,信息确认无误后,届时参加招生考试。考试有初试和复试两个部分,考试成绩合格的学员,获得山东科技大学发放的录取通知书。最后学员在该校规定的时间内,完成入学手续的办理。学员在山东科技大学规定的学制期限内,完成专业计划的全部学习任务,达到证书授予的条件,即可获得该校颁发的双证。山东科技大学是山东省直属的、山东省和青岛市共建的正规公办大学。以上就是对山东科技大学在职研究生报考流程的介绍,有报考意向的学员,根据上述的流程完成报考。学员在山东科技大学获得的双证是在职研究生毕业证书和硕士学位证书,证书的含金量比较高,受国家和社会的认可,可用于报考公务员、职称评审、积分落户等。想要了解更多关于山东科技大学在职研究生的问题,您可以关注我们,掌握最新政策信息。考研政策不清晰?在职申硕有困惑?院校专业不好选?点击底部官网,有专业老师为你答疑解惑,211/985名校研究生硕士/博士研究生开放网申报名中。山东科技大学在职研究生预报名地址:https://www.87dh.com/yjs2/
2023-07-23 19:41:031

我和英语的故事作文600

⑴ 跪求一篇英语作文:一次美好的回忆(经历)!!!!600字左右! 五年中,风风雨雨,朝朝暮暮;花开花谢,潮起潮落。每一个欢笑,每一滴泪水,每一段故事,每一段经历,每一声感动,都让我难以忘怀。如今,我们即将告别母校,一股眷恋之情,从我心底油然而生。 五年的小学生活,将在我身旁匆匆逝去……过了毕业考,到了九月份,我就真正成为初中生了。五年中,风风雨雨,朝朝暮暮;花开花谢,潮起潮落。每一个欢笑,每一滴泪水,每一段故事,每一段经历,每一声感动,都让我难以忘怀。如今,我们即将告别母校,一股眷恋之情,从我心底油然而生。 走进学校大门,只见前面墙上有着几十个金光闪闪的大字,那便是我们的校训。往右转弯,左边便是我们的塑胶大操场。它是那么红,那么耀眼。在那儿,记录找我们的喜怒哀乐。 看,那儿是新大楼。我们五(一)班,就在二楼。一步一步、慢慢地踏上楼梯,转眼间,你已经来到了我们的教室。听着笑声,看着笑容,我不经意间摘下记忆的银河中最闪亮的一颗星,细细地欣赏着。 五年级第一学期的4月25日,也许是全班人挥之不去的时刻,因为那天是顾家维的生日。中午,他的爸爸带来了一盒大蛋糕。望着它,我们馋得口水直流三千尺。大家都沉浸在喜悦的氛围中。 开始送礼物了!我们各自拿出了礼物。邬浩睿送他一只崭新的书包,就在送的一刹那,不知是谁按动了快门,“咔嚓”一声,照相机将这一刻定格为永恒。男生们也陆陆续续地送他生日礼物,并由衷地献上一句:“祝你生日快乐!” 我们女生最具有代表性,我们凑钱买了本带锁笔记本,希望他敞开自己的心扉,把心里话写上去。 切蛋糕喽!我们先在“小寿星”的额头上用奶油一点,把最大的一块蛋糕分该他,剩下的分给全班与其他老师。我们这些“小调皮”,一边吃蛋糕,一边与男生进行奶油大战。你把奶油涂到我脸上,我不但顾不着去擦,反而还开始强烈地反抗和进攻。 吃完蛋糕,轮到全班写祝福语。看:“小心!你太胖了!要紧急‘刹车"!”;“你胖乎乎的,真像头小猪。所以,祝你生日快乐!”;“别担心,我已经想好了你 下一个生日礼物,那就是呼拉圈,锻炼身体!”……一字字,一句句,从字里行间,都是俏皮的语句,但俏皮之中,处处蕴含着我们真挚的友谊! 想到这儿,我不禁笑了,笑得是那么甜。 既高兴又有些伤感的我,又轻轻地走出了校门。夕阳之下,我回头再望望校园;夕阳之下,我回头再望望校训;夕阳之下,我回头再望望五星红旗!所有留恋之情,尽在这一刻! 童年的脚印,留在了校园的小路上,笑语欢歌在花坛的馨香中……我的一只脚兴冲冲地跨出校门,另一只脚却在童年的梦中迟迟不肯出来。别了,我即将离开的母校! ⑵ 写作文用英语写我的故事600字 寒假里,我和爸爸、妈妈去嵊州体验了一番泡温泉的感觉。 我们来到嵊州,先到宾馆,吃了中饭,安顿好后,就出发了。不到一个小时的车程,我们就来到了温泉。我发现这里人人山人海,热闹极了。我们买好票,进了温泉城,在更衣室里换好衣服,就开始了我们的泡温泉体验。 我先来到室内的一个大池子前,用脚试了一下水温,泉水不冷不热,刚刚好,于是小心翼翼地走了下去,泉水刚到我的腰,我慢慢地蹲下去,坐在池里,泉水刚好没过我的脖子。我就这样整个身子浸在水中,两手靠在池边,尽情地享受着。温泉水给我的 *** ,舒服极了。泡完之后,我就在池边的大浴床上躺了一会儿。大浴床下面有一个喷头,只要按一下旁边那个圆圆的按钮,喷头就会自动喷出水来,为人们冲掉疲惫和烦恼。 中间休息了一会后,我们又来到了小温泉的地方。那里还有一个大游泳池,有许多人在游泳,那里的水比大池里的水要热,热得我直冒汗。 体验完室内的温泉,我们又来感受了一下室外的温泉,这里的水温比室内的要高。而且水还是红色的,好像泡在红酒里。池子旁边是一个湖,湖口对面是一座雪山,泡着温泉望着雪山觉得自己好像在画中。这时空中飘起了雪花,又觉得自己到了仙境,从未有过的感觉。 泡完温泉出来,整个身子轻松了许多,热乎了许多,心情舒畅了许多。如果有机会,你可一定要去体验一下泡温泉的感觉。定会让你终身难忘。 ⑶ 写一篇英语作文“a story”讲述一个与自己有意义的故事,不少于120次,要求自己写的 多阅读,在阅读过程中掌握许许多多新词汇.每接触一个新词,要自己造几个句子,让自己能灵活运用.然后在写自己的文章时加进去,那么自己的作文就如虎添翼了!还要用一些连词,让自己的文章更自然.如and,well,however,therefore… 归纳这几点: 1、以图表提供情景的作文要以“读”为主,首先要读懂图表中的数据、时间、编码、序号以及相互间的变化关系,对所给的信息加以分析、推断、筛选、概括、去粗取精;在写作时目的要明确,要注意内容的准确性和严肃性,尤其是图表中的数据、时间等不得有误。 2、以图画提供情景的作文应以“看”为主,通过细心观察图中的人物、景物、文字、环境、数字等,弄清写作的意图,通过分析思考把握逻辑联系,找出主题并借助所给的文字,把图中的信息转化成文章,但要注意,文章不能停留在图画的浅表,而要表达出提供情景的意图和内涵。 3、以提纲提供情景的作文。这种形式本身的要点已经很明确,重点也很突出,只要把各个提纲加以发挥,注意遣词造句的灵活性和语法规则的正确性,就不会造成审题不清而偏离主题,但要注意,文章必须覆盖所提供的各个提纲的要点。 4、以书信格式提供情景的作文。首先要了解书信的格式,英文书信格式与中文有所不同,(1)、一般在信纸的右上角写上写信人的地址和日期,地址应按从小到大的顺序排列;(2)、左边顶格写上收信人的姓名;(3)、正文部分;(4)、祝愿的话;(5)、写信人签名。信的内容一定要按所给的要求写,不要漏写。 二、用英文写作不同于用母语那样得心应手,常常会受到生词、语法、惯用法的限制,只要平时注意两种语言的异同性,抓住写作要点,也可妙笔生花。 1、为了保证文章层次分明、条理清楚,要把时间固定下来,如:记叙一件事要用过去时;写经常发生的事或对人物的描写,要用一般现在时。整个文章中的人称要一致,首尾呼应,不要随意改动,以免造成误解。 2、不要为了追求“一鸣惊人”而去找一些生冷的词汇,对这些一知半解的词你不会用,不知道如何搭配,结果可能适得其反,使文章显的生硬、不协调,甚至错误百出,所以要使用有把握的词,避免不必要的失分。比如说发生了一起意外事件,我们通常用“have an accident ”来表示,不要错误的使用“have an incident”。 3、注意不同语言的表达习惯,也是写好英语作文的重要环节,如“我的理想是做一名歌手”,很多同学写成“My ambition is to do/make a singer,” “to do”表示“做”或者“干”,“to make”表示“制作”,而“做一名歌手”则表示“成为一名歌手”应该用“be/bee a singer”;又如“看书、看报”应用“read a book/newspaper”,而不是“see a book/newspaper”。因此,平时应该注意不同语言的表达习惯,切忌望文生义或一味生搬硬套。 4、有些同学因怕出错而只写短句或简单句,写出的文章过于幼稚、空洞乏味。要使文章有血有肉就要把平时学的知识用进去,如:定语从句、宾语从句、非谓语动词和比较等句型,关键时用上一、二个,就能使文章不同凡响,更有文采,特别是对关联词的使用,如“so that”、“not…but ”“not only...but also”等,会使你的文章逻辑结构紧密、层次鲜明、条理清楚,更能显示出你的英文功底,但要做到这些并非一日之功,要靠平时的不断训练和积累。 5、最简单的增分点就是认真的书写。工整漂亮的书写会给评卷老师留下美好的第一印象,在扣分时自然会“手下留情”,而且很多地区都在写作上有1分的书写分。只要平时多下点功夫,得到这一分并不难。 这里有一篇: Sunrise It is said that the scene of sunrise is beautiful, but I had never seen it before. It was so hot last night that I didn"t sleep well. Early this morning I got up and came to the balcony to relax. It was cool outside. I looked up at the sky, the sparse stars inkling there. Everything around me was dim. I gazed at the east, where the sky was lightening. After a while, the stars disappeared and the buildings, trees, streets in the distance could be seen faintly. Slowly, the horizon in the east was being reddish. The red color extended continuously and was being thicker and thicker. At last the sun showed its face a little, graally into a half flaming ball, and whole ball appeared, shining brightly. Everything around me was clear. What a beautiful sunrise I saw! ⑷ 英语作文有趣的家庭故事作文 In my family, my mother is the "boss", is "second" I daddy nature is "old"! My home is particularly funny, not letter you look down: Families of military Today is Saturday, the whole family to have a rest. I don"t know what"s the matter, "the boss" suddenly said: "attention, to the right, look ahead." "The second" to cook laundry for me, "old" give me to sweep the floor mop the floor. Go to! "So, we will act." Second "to buy food, I"m sweep the floor, and" the boss ", lying in bed, leisurely watch the TV." Penis is back, cooking, and said: "today," the boss "is how, have to our own household chores. "On the side of me to say:" early know I wouldn"t have ⑸ “我和英语有个故事”英语作文 My name is Michael. I will tell you a story about myself. I graated from China University of Mining and technology in 2006. I was hired by Founder Sofare Co., as a Net engineer in the previous 11 months. I significantly benefit from these knowledge on Visual Studio 2005, Microsoft SQL Server 2000 etc learned in school. I am working in VaconCN now as an IT website engineer. I think I can do this job very well, at the same time; it"s a challenge to me. I can learn more new knowlege. I like to play badminton. I play it Xinghai Coliseum Every weekend. It"s very interesting. I also like go to KTV with my friends, I like Ben john. I think his best song is “it is my life”. When I headed it, this song concert blew me ⑹ 英语作文一件令我心碎的故事 Last Monday when I stepped into my classroom, my monitor told us that our class teacher, Mr Sun, had passed away in a traffic accident. It seemed so unbelievable because he used to give us lessons on Monday morning. I couldn"t accept the fact until the headmaster came to tell us the truth. 上周一我走进教室的时候,我的班长告诉我们,我们的班主任孙老师在一场交通事故中去世了。这是多么的不可思议,他过去常常在星期一上午给我们上课。我不能接受这个事实,直到校长来告诉我们真相 Mr Sun was a middle-aged teacher. He was full of sense of humor. We all liked him very much because of his excellent teaching. His lessons were usually very lively and interesting.We all liked to attend his class. He was an experienced teacher. 孙老师是一位中年教师。他很有幽默感。因为他出色的教学我们都很喜欢他。他的课通常是非常活跃和有趣的。我们都喜欢上他的课。他是一个有经验的老师。 Mr Sun will always live in our hearts! 孙老师会永远活在我们心中。 ⑺ 作文推荐和英语小故事 1.The Country Squire In a *** all pretty village in Notting ham shire there formerly lived a respectable Squire, who excelled all his friends in amusements athletic, and whose manner of living was far from ascetic. A wife he had taken for better or worse, whose temper had proved an intolerant curse;but at length, to his great and unspeakable joy, she died when presenting a fine little boy.Strange fancies men have;—the father designed to watch o"er the dawn of his son"s youthful mind,—that,only approached by the masculine gender, no room should be left him for feelings more tender.“Had I ne"er seen a woman,” he often would sigh,“What Squire in the country so happy as I!” The boy was intelligent, active, and bright, and took in his studies unmon delight;no juvenile follies distracted his mind; no visions of bright eyes, or damsels unkind, and those fair demisisterly beings so gay, yclept“pretty cousins, ne"erpopped in his way; till at length this remarkably singular son could number of years that had passed enty one.” Now the father had settled, his promising son should his studies conclude when he reached enty one;and he went,with a heart beating high with emotion, to launch the young man on life"s turbulent ocean.As they entered the town,a young maiden tripped by, with a cheek like a rose, and a lightlaughing eye.“O father, what"s that?” cried the youth with delight, as this vision of loveliness burst on his sight.“O,that,” cried the cautious and politic Squire, who did not they outh"s ardent glances admire,“is only a thing called a Goose,my dear son ;we shall see many more ere our visit is done.” Blooming damsels now passed with their butter and cheese,whose beauty might even an anchorite please:“Merelygeese!” said the Squire,“don"t mind them,my dear;thereare many things better worth looking at here.” As onwards they passed, every step brought to view some spectacle equally curious and new;and the joy of the youth hardly knew any bounds, at the roped ancers, tumblers, and merry gorounds. As soon as the tour of the town was pleted, the fatherre solved that the boy should be treated; so, pausing an instant,he said,“My dear son, a new era today in your life has begun;now of all this bright scene and the gayeties in it,choose whatever you like,it is yours from this minute.”“Choose whatever I like?” cried the jouthful recluse.“O, thank you,dear father, then give me—a goose!” 乡绅 从前,在诺丁汉郡的一个美丽的小村庄里住着一位可敬的绅士。他玩起体育竞技游戏来比所有的朋友都高强,过的日子绝不是苦行僧式的。不管是福是祸,他娶了个妻。结果她脾气奇坏,成了个难以忍受的灾星。终于,她在产下一玲珑佳儿后死去,乡绅先生的万分欣喜自是不可言传。人不时会突发奇想。这位父亲决定亲自督察儿子年幼的头脑的启蒙,务必使他接触的都是男性,绝不留下余地萌生更温柔的感情。“倘我从不曾见过女人,”他常常叹息道,“全国的乡绅里谁人能有我快活!”那男孩聪明、活泼而又通达事理,异常地喜欢学习。从不因小孩子的胡闹而分心;从没有明亮的眸子,或狠心的小妞,或被谓之“妩媚表亲”、半似姐妹的放肆尤物突然出现在他面前。到最后,这位非同寻常、出类拔萃的儿子终于度过了21个年头。 父亲决定,他的前途无量的儿子在21岁时应该结束学业。于是他满心激动地带领年轻人启航进入汹涌的人生之海。当他们进城时,正有一少女款款经过,腮如玫瑰,眼笑流波。“哦,父亲,那是什么?”当那可爱身影闯入他的眼帘时,年轻人快乐地喊道。“噢,那个,”谨慎而讲究谋略的乡绅根本不赞赏儿子热烈的目光,于是大声说,“不过区区一笨鹅而已,我亲爱的孩子,我们一路还会见到很多的。” 携奶油乳酪的如花少女络绎而过,就是隐士也会被她们的美丽打动。“不过是些笨鹅!”乡绅道,“我儿不必放在心上,此间有许多事物更值得一观呢。”他们继续前行,每一步都见到同样新奇有趣的景象,年轻人看到走绳索的,翻斤斗的,和旋转木马等等,其乐也无穷。 小城之行一结束,父亲就决定要款待儿子。于是,他停顿片刻后说,“我亲爱的儿子,今日起你的生活开始了一个新的时期。现在,在所有这眩目景象及种种赏心乐事中,选出你最喜爱的,你立刻就能得到它。”“由我任意选择?”年轻的隐居者大叫,“啊,谢谢你了,父亲,那就给我一只笨鹅吧!” 2.Speeding A speeding motorist was waved down by a police patrol car. “I"m going to give you a ticket for speeding,” said the policeman, writing his note. “You"ve been driving over 60 miles per hour.” “Would you mind making it 100, officer?” was the reply. “You see, I"m going to sell the car.” 超速行驶 一名超速行驶的驾驶员被巡逻警车拦住后,警察一边做记录,一边说:“我要给你开一张超速罚单,因为你刚才的车速已经超过了60英里。” “警官,请你把时速写为100英里好吗?你知道,我正要打算卖这辆车。” ⑻ “我最喜欢的童话故事”英语作文 since i was a little baby, my parents read simple stories for me. they bought me many cartoon books with stories. they were my bedtime stories. among all the interesting stories, i like fairy tales most, because they are often beautiful love stories beeen prince and princes or cinderella. they are so moved and full of love. besides, in fairy tales, no matter how much 旦户测鞠爻角诧携版超毛权they suffer, they will always live a happy life in the end. the happy endings bring hope and satisfaction to people, making us hopeful to our own lives. ⑼ 用英语写一篇关于自己的一个小故事60 这是我之前写的一篇文章 A Scary Experience In 2002 a very scary thing happened around me.One day, at school,as usual, my clas *** ates and I were having our physics class. Most of the students were paying attention to what the teacher was saying, but some boys were looking around and not listening to the class. Nothing seemed unusual. Suddenly, one of my clas *** ates shouted, “Look outside!! Someone jumped out of that window!” This definitely interrupted class, but everyone ignored him because no one believed that people just jumped out of a window in a tall building. People always tell lies and try to trick you, so no one took any action about it. My clas *** ate was still saying, “Believe me, it is true.” After a few minutes, the truth shocked everyone, because my clas *** ate was right. A student just mitted suicide by jumping from the building which was facing ours. The class stopped and some brave people went outside to see, but I didn"t. They told me there was blood all over the ground. They couldn"t even recognize who that student was because his face was all messed up. People from the school quickly covered the dead body. In a few minutes, everyone in the school knew what just happened. This whole event happened so quickly. There were actually o people who saw the whole thing. One was my clas *** ate who shouted in the class and another was a teacher walking nearby. The teacher was totally scared. At the moment the student dropped on the ground in front of her she sat down with her eyes shut tightly. I heard that after this event the teacher was in the hospital for a month. 我已经删减了一些,不过貌似还是过长,你看着办吧,可以再修改些
2023-07-23 19:41:031

engineer怎么读

Engineer读音为 [u02ccen-du0292u026au02c8nu026au0259(r)],其中en音为元音发音[e],du0292发音为[u02a4],i发音为[i],n发音为[n],u0259(r)发音为[u0259(r)]。整个单词的重音在第二个音节上,即“gi”这里,这是一个二合字母,的发音为[u02a4u026a]。 在英语中,单词engineer通常指工程师,也就是进行工程设计、研发、制造、生产和维护的专业人员。这个词在工业、科技等领域非常常见,因为工程师是现代科技和工业界中不可或缺的重要人物。相信很多学习工程师学科的人都会经常用到这个单词,所以正确掌握engineer的发音有助于我们更好地进行工程领域的学习和交流。
2023-07-23 19:41:041

the number nine rhymes with fine and dine

数字9押韵罚款和吃饭
2023-07-23 19:41:064

基尼系数是什么?

基尼系数是国际上用来综合考察居民内部收入分配差异状况的一个重要分析指标,由意大利经济学家于1922年提出。其经济含义是:在全部居民收入中,用于进行不平均分配的那部分收入占总收入的百分比。 基尼系数最大为“1”,最小等于“0”。前者表示居民之间的收入分配绝对不平均,即100%的收入被一个单位的人全部占有了;而后者则表示居民之间的收入分配绝对平均,即人与人之间收入完全平等,没有任何差异。但这两种情况只是在理论上的绝对化形式,在实际生活中一般不会出现。因此,基尼系数的实际数值只能介于0~1之间。 目前,国际上用来分析和反映居民收入分配差距的方法和指标很多。基尼系数由于给出了反映居民之间贫富差异程度的数量界线,可以较客观、直观地反映和监测居民之间的贫富差距,预报、预警和防止居民之间出现贫富两极分化,因此得到世界各国的广泛认同和普遍采用。 按照国际惯例,基尼系数在0.2以下,表示居民之间收入分配“高度平均”,0.2~0.3之间表示“相对平均”,在0.3~0.4之间为“比较合理”,同时,国际上通常把0.4作为收入分配贫富差距的“警戒线”,认为0.4~0.6为“差距偏大”,0.6以上为“高度不平均”。
2023-07-23 19:41:062

在线等,很急的问题,我的usb接口不能用了,看了硬件里有黄色的问号,usb flash disk标示,怎么弄啊?

可能接口坏了吧,一台电脑至少有四个接口,主机后面有两个,你试下后面的能不能用,不能用就可能是你的移动硬件的问题!
2023-07-23 19:41:104

山东科技大学数学专业研究生在哪个校区

黄岛校区
2023-07-23 19:41:114

求一个初中英语主要语法口诀问题(知道里有的,找不到了)

“江阴市网上家长学校”里有,比较全网址是 你自己去啊看下啊 http://www.jynetedu.com/edu/educms/news_view.jsp?nid=3562949
2023-07-23 19:40:592

变频器载波频率值的正确选择?

变频器载波频率值的正确选择 1 低压变频器概述 对电压≤500V的变频器,当今几乎都采用交—直—交的主电路,其控制方式亦选用正弦脉宽调制即SPWM,它的载波频率是可调的,一般从1-15kHz,可方便地进行人为选用。但在实际使用中不少用户只是按照变频器制造单位原有的设定值,并没有根据现场的实际情况进行调整,因而造成因载波频率值选择不当,而影响正确,感觉的有效工作状态,因此在变频器使用过程中如何来正确选择变频器的载波频率值亦是重要的事。本文就此提供应该从以下诸方面来考虑,并正确选择载波频率值的依据。2 载波频率与功率损耗 功率模块IGBT的功率损耗与载波频率有关,且随载波频率的提高、功率损耗增大,这样一则使效率下降,二则是功率模块发热增加,对运行是不利的,当然变频器的工作电压越高,影响功率损耗亦加大。对不同电压、功率的变频器随着载波频率的加大、功率损耗具体变化,可见图1A-E所示。3 载波频率与环境温度 当变频器在使用时载波频率要求较高,而且环境温度亦较高的情况下,对功率模块是非常不利的,这时对不同功率的变频器随着使用的载波频率的高低及环境温度的大小,对变频器的允许恒输出电流要适当的降低,以确保功率模块IGBT安全、可靠、长期地运行。可参见表1及图2A-D所示。4 载波频率与电动机功率 电动机功率大的,相对选用载波频率要低些,目的是减少干扰(对其它设备使用的影响),一般都遵守这个原则,但不同制造厂具体值亦不同的。 例,日本有下列关系供参考 载波频率 15kHz 10kHz 5kHz 电动机频率 ≤30kW 37-100kW 185-300kW 例,芬兰VACON 载波频率 1-16kHz 1-6kHz 电动机功率 ≤90kW 110-1500kW 例,深圳安圣(原华为) 载波频率 6kHz 3kHz 1kHz 电动机功率 5.5-22kW 30-55kW 75-200kW 例,成都佳灵公司JP6C-T9系列 载波频率 2-6kHz 2-4kHz 电动机功率 0.75-55kW 75-630kW 5 载波频率与变频器的二次出线(U,V,W)长度 载波频率 15kHz 10kHz 5kHz 1kHz 线路长度 <50M >50-100M >100-150M >150-200M 6 载波频率对变频器输出二次电流的波形 众所周知变频器的逆变(DC/AC变换)部分是由IGBT通过正弦脉宽调制SPWM后,产生呈正弦波的电流波形,那么载波频率的大小、直接影响电流波形的好坏程度,以及干扰的大小,而且载波频率的大小是较为敏感和直接的,所以在运行过程中首先要正确选择载波频率值的大小后,然后再考虑附加各种抑制谐波装置,例AC电抗器、DC电抗器、滤波器、另序电抗器,及安装布线、接地等措施,这样处理是较合理的、更有效的,切不可本未倒置来处理问题,这是很重要的原则。当载波频率高时,电流波形正弦性好,而且平滑。这样谐波就小,干扰就小,反之就差,当载波频率过低时,电机有效转矩减小,损耗加大,温度增高的缺点,反之载波频率过高时,变频器自身损耗加大,IGBT温度上升,同时输出电压的变化率dv/dt增大,对电动机绝缘影响较大。具体例如表2。7 载波频率对电动机的噪音 电动机的噪音来自通风躁音、电磁噪音、机械噪音三个方面,对通风和机械噪音在此估且不谈,只就使用变频器后对电磁噪音问题作下分析。 变频器的输出电压、电流中含有一定分量的高次谐波,使电动机气隙的高次谐波磁通增加,所以噪声变大。其特征为: (1)由于变频器输出的较低的高次谐波分量与转子固有频率的谐振,使转子固有频率附近的噪音增大。 (2)由于变频器输出的高次谐波使铁心、机壳、轴承座等的谐振,在固有频率附近的噪音增大。 (3)噪音与载波频率大小有直接关系,当载波频率高时相对噪音就小。 (4)经测试得到当电动机在变频运行时,比在工频50Hz运行时,噪声只大2dB可见影响不很大,其绝对值约在70dB附近。 (5)采用变频电动机能降低相同运行参数时的噪音6-10dB。8 载波频率与电动机的振动 电动机的振动原因可分为电磁与机械两种,这里估且不谈机械原因,只就电磁原因作下分析: (1) 由于较低次的高次谐波分量与转子的谐振,其固有频率附近的振动分量增加。 (2) 由于高次谐波产生脉动转矩的影响发生振动。 (3) 当采用变频器后在相同50Hz频率下工作时振动略大,尤其当工作频率20Hz时振动将增至全振幅为7um,工作频率80Hz-120Hz全振幅将增为6um,且电动机极数小的较极数大的略为严重。 (4) 可采用输出AC电抗器减振动。 (5) 将v/f给定小些。 (6) 采用变频电动机可降低振动。 (7) 对高速磨床等可采用低噪声、低振动的专用电动机。9 载波频率与电动机的发热 由于逆变器采用正弦脉宽调制后其电流输出波形是近似正弦波,谐波分量见图3,必定有一定分量的各次的高次谐波产生,以及波形不够光滑有毛刺出现,庶必造成输出电流的增加可达10%,而发热与电流I2成正比,因此在相同工作频率相同负荷下,使用变频器后电动机的温升略高些,为尽可能减少这部分损耗,要尽可能使载波频率值大些,对运行有利,或选用变频电动机,具体解决办法是: (1) 尽可能选用较高载波频率,以改善输出电流波形。 (2) 加装输入、输出AC电抗器或有源滤波器等。 (3) 选用变频电动机。 (4) 变频器的工作频率要低于20Hz,而生产设备就要低速,而且有较大的负荷运行时, (下转34页)(上接50页)电动机输出轴后再加装一级减速器,以利工作频率(变频器)提高,且增大输出转矩,以利统一解决负荷的要求、变频器的许可,以及电动机的振动、噪音、发热、工作频率、载波频率几方面统筹的合理解决。10 载波频率与变频器输入三相电流的不平衡度 变频器的输入部分是6脉冲三相桥式二极管整流电路即AC/DC变换,由于二极管是非线性元件,在实际装配时,每个元件的内阻抗不会一致,造成三相不匹配,又因输入电流是非正弦性,这样就造成输入变频器的三相电流的不平衡产生原因,尤其当输入电压就存在较大的不平衡,例:有3-5%的差值,这样三相输入电流最大可能出现有10-20%的差别,这是经常有可能出现的,为改善输入电流三相的不平衡度,尽可能减少起见,通常采用以下方法: (1) 改善电网品质使它不平衡度尽可能小些。 (2) 选用高档次优质品牌的变频器。 (3) 尽可能提高载波频率值。 (4) 调换R、S、T三相的相序(变频器输入电压相位不需理相) (5) 选用变频电动机 通过以上方法使三相不平衡度尽可能减小为原则,要绝对平衡难以做到的。但变频器输出三相电流基本是平衡的,这里还要注意的测量变频器的输入或输出电压、电流时,最好选用一只,只反映基波(50Hz)的带有滤波的电压、电流表、钳形电流表万能或表为宜,否则测量值比实际值出现偏大的现象,这点亦要注意的。
2023-07-23 19:40:551

u盘驱动程序安装失败 General USB Flash Disk USB Device

win7的关系 用xp 就没有烦的了 win7现在还不成熟
2023-07-23 19:40:545

基尼系数是什么?

贫富差距指数即基尼系数。基尼系数是指国际上通用的、用以衡量一个国家或地区居民收入差距的常用指标。基尼系数最大为1,最小等于0。基尼系数越接近0表明收入分配越是趋向平等。国际惯例把指数在0.2以下视为收入绝对平均,指数在0.2至0.3视为收入比较平均;指数在0.3至0.4视为收入相对合理;指数在0.4至0.5视为收入差距较大,当基尼系数达到0.5以上时,则表示收入悬殊。扩展资料:基尼指数的优缺点:1、优点基尼系数由于给出了反映居民之间贫富差异程度的数量界线,可以较客观地反映和监测居民之间的贫富差距,预报、预警和防止人民之间出现贫富两极分化。因此得到世界各国的广泛认同和普遍采用。2、缺点并没有显示出资源在哪里存在分配不公。国际间,并无制定基尼系数的准则,一些问题如应否除税项,应否剔除公共援助受益者,应否剔除非本地居民,或应否加入政府的福利,并没有一致性,以至没有比较的准则。参考资料来源:百度百科-基尼指数
2023-07-23 19:40:521

为什么用火狐打开,asdas 在后面,而ie打开在下一行,怎么调整火狐和ie都一样在下一行!

position:absolute;top:*px; 给asdas的div加个这个position:absolute;top:*px; *自己看情况填
2023-07-23 19:40:483

NELTA是什么牌子的变频器

应该是台达
2023-07-23 19:40:453

为什么 u盘 叫做 USB Flash Disk?

flash 闪光
2023-07-23 19:40:453