一欧等于多少元

直径0.3,0.3的单位是mm吗?如果是：
r=0.3/2=0.15; L=1m=1000mm
电阻率 p=Rs/L=1*3.14159*0.15^2/1000=7.0686*10^-5,我暂找不到哪种材料是此电阻率的,可能合成此电阻率的有多种材料,你试找找吧.

1.因为一个是每秒均匀地减小2Wb,一个是每秒均匀地增大2Wb,如果Δt1=Δt2,那么线圈中产生的感应电动势在△t1+△t2时间内的平均值才为零（Ε=ΔΦ/t).
2上述第1种情况和该种情况不同,上述情况一个增加一个减小,总变化量为零（ΔΦ=0）;
现在第2种情况是磁通量一直减小（反向增大相当于减小）,所以变化量不为零（ΔΦ≠0）.

不正确.
正常的表达顺序是：如果导体的电压是1v,导体的电阻是1欧,则通过导体的电流是1A.
也就是说,电流是由电压、电阻共同决定的.影响电阻的因素不是电流和电压,是导体的长度、材料、横截面积和外界的温度.

条件不够,无解!

September 11,1862.Europe and the United States,one of the most famous short stories?Henry (O.Henry) was born in a small North Carolina,United States town.His father was a doctor.When the 15-year-old apprentice in his uncle's dispensary.After five years on a ranch in Texas to break.After accounting done in 1884,Landscape clerks and bank tellers.1896,the bank found that the lack of arbitrary,a small European?Henry arrested for others.He asylum to Latin America via New Orleans.In 1897,returned to visit his wife,was arrested and sentenced to five years in prison.Has served as a pharmacist in prison,and has begun to Europe?Writing for the pen name Henry short story,"Maikelu:er" magazine.In 1901,for "good conduct" early release,New York specializing in writing.Europe?Henry created by more than 300 short stories income "cabbage and the Kings" (1904)."4" (1906),"West Heart" (1907),the "City of Spring" (1908)."Rolling Stone" (1913) collection,which depict the life of the works of the most famous in Manhattan,New York.He regarded the street where small restaurant,the atmosphere of exaggerated dilapidated apartment very realistic,Therefore,"the poet laureate of Manhattan," said.He has a cheater of life as its theme,written many short stories.The author attempts to show that the upper unchanged,many senior people is a swindler,a successful crook.Europe?Henry society and the life of observation and analysis is not profound,some works are relatively shallow,but his life frustrations,Think of ordinary people often lonely and distraught,but also to demonstrate their artistic ingenuity of the complex feelings.Therefore,the most outstanding of his short stories such as "Love sacrifice","The Cop and the Anthem" and the "furnished rooms" "Magi gifts," such as "The Last Leaf of Rattan" among the list of the world's outstanding short story.From the artistic point of view,the EU?Ironically,Henry good at capturing life imbued with the philosophy of dramatic scenes.sketching cartoon characters with a brush-like characteristics.Plot development works faster at the end when a sudden unexpected end,readers consternation,we must admit that the story is fair and reasonable and in turn praised the ingenious idea of the author.His lively writing,and be good at using puns,falsely sounded leaked and the old Code novelty and wit.He also accurately describe the details to create and playback atmosphere.Particularly cosmopolitan nightlife atmosphere.In New York,published a large number of literary and artistic works,to gain in both wealth and fame.He not only recklessness,but gambling,a good bottle of wine Tanbei.Writing in the excesses of his life and tired of serious bodily injury.1907,the EU?Henry remarried.Unfortunately,the second marriage for him no happiness at all.June 3,1910,he became ill.Two days later,on June 5,died,died of liver cirrhosis,only 48 years old.

因为磁通量有正负,第一个问题是如果开始的时候是△,最后增加后的磁通量也是ф,所以△ф为0,则平均电动势为0.
第二个问题如果磁通量的变化量由最大和最小的差值决定,△ф一定不为0,所以平均电动势不为0.

1/（1/6+1/6）=3

一欧等于0.001千欧
一欧等于0.000001兆欧
一千欧等于1000欧
一千欧等于0.001兆欧
一兆欧等于1000000欧
一兆欧等于1000千欧

周诗：表现了诗人对“春雨‘的喜爱之情①春雨有利于农人耕作；②春雨水量可观
周诗要点：①含蓄委婉的抒情风格(全诗不见一个“喜”字)；②侧面描写的表达效果(“耕人”、“花”、“鸥”的作用)；③结构布局的变化性(先言他物,侧面表现,后见主体,正面突出“春雨”,前后呼应,彼此补充) .

耒：古代的一种翻土农具农夫们手里拄着锄头,在林边说着农事,远处野花从初,不时有鸟儿落下.北宋 周邦彦 七绝 春 雨 耕人扶耒语林丘,花外时时落一鸥.欲验春来多少雨?野塘漫水可回舟.这首诗表现了诗人对“春雨”的喜爱...

拉长为两倍,长度变为原来2倍,截面变为原来1/2
电阻=p*(1/2S)/2L=1/4pS/L=0.25欧姆

1乘10的负三次方

因为时间已经接近黄昏,希望以后能（有机会）游览,桂花（开放）的盛况在这里（观赏）是最佳的了,（此时）在花下喝一杯清茶.

加降阻剂、盐水、增加接地体,深埋接地极.

我最爱春天的乡村,春雨飘洒的时候,那泥土的芬芳啊,是那样的亲切,又是那样的久远.看着大地在春雨的滋润下,是那样的生机盎然,我心中也充满生长的力量.我最爱傍晚细雨蒙蒙中,被袅袅炊烟笼罩的乡村,是那样的静谧安详.
傍晚,雨过天晴,村落更有别样的一番情景：朗朗晴空,是那样的纯净、美丽——天空半是浅兰,半是火红,丝丝缕缕的云悠然自得飘荡,一会儿是绚丽的火红,一会儿是纯洁的雪白.
微风过处,空气中弥漫着桃花的芬芳,你看水边那株桃树,花开得多么茂盛,“桃之夭夭,其叶蓁蓁.逃之夭夭,其华灼灼.”我不禁吟诵起《诗经》中的句子,桃树因为水的滋润而充满生机,水因为桃花的映衬而光彩照人.这是多么美丽的风景“水面桃花相映红.”
如丝如缕的炊烟升起来了,面对如此宁静美丽的风景,（我心陶醉）是那样的令人赏心悦目,那样的令人陶醉,这时耳边便响起了牧童悠扬的笛声,我循声望去,不见其人,只看见一头老牛在悠然自得的甩着尾巴,向村子走来,它背上一只鸥鸟已睡着了,老牛的走动丝毫不影响他的睡眠,一天的飞翔劳累,已使鸥鸟沉沉地睡去.看到老牛独自走来,不禁想问牧童何处去了?
落日的余辉,给乡村披上了一件美丽的纱衣,不久,乡村就在宁静中睡着了.
（你用点重要的,不就少了吗?!）