由不确定公式可以知道,电子向原子核内部塌陷时会产生很大的能量（虽然塌陷现象不存在.）请问这个能量是从什么地方得来的呢?

点和面接触,受力垂直于该面的切线方向,球的半径垂直于那个切线,所以力的方向是沿着半径的,也就是过球心的

设a队胜x场,平y场,输12-x-y场
3x+y=19 .(1)
12-x-y>=0.(2)
又(1)得y=19-3x代入(2)中得
12-x-19+3x>=0
2x>=7
x>=7/2
由(1)得 3x

he is your classmate,isn't he?
英语用反问表示肯定.他是你的同学,对吧.
或者.he is your classmate.right?

Prudence principle in the embodiment of accounting must side
Pick to
Prudence principle is also called the prudence principle, steady socialist, conservatism in accounting environment, such as uncertainty factors and risk, accounting elements of the recognition and measurement accuracy affected cases, should use caution professional judgment and safety of accounting accounting methods. The debt can be expected to fully, losses and expenses, as far as possible plan or no possible assets and income, lest accounting statements reflect accounting information cause the users of financial statements of the blind optimism. Prudence principle can be embodied in recognition, measurement and reporting and other aspects. It requires: accounting confirming standard safely reasonable; Accounting measurement may overstate assets, right and profit; Accounting report provides comprehensive as possible accounting information

d.因为A和C都符合要求,但除了对角线相等外没有其他条件,无法选择具体是哪一项,故选择D.

1、工资个税的计算公式为：
应纳税额＝（工资薪金所得 －“五险一金”－扣除数[3500]）×适用税率－速算扣除数
如：
85元税金=（6000工资-600五险-3500 起征额）X10%适用税率 -105 速算扣除数
2、2011年 9月1日起执行7级超额累进税率：扣除数为3500元.
全月应纳税所得额 税率 速算扣除数(元)
全月应纳税额不超过1500元 3% 0
全月应纳税额超过1500元至4500元 10% 105
全月应纳税额超过4500元至9000元 20% 555
全月应纳税额超过9000元至35000元 25% 1005
全月应纳税额超过35000元至55000元 30% 2755
全月应纳税额超过55000元至80000元 35% 5505
全月应纳税额超过80000元 45% 13505

估计再过50亿年,
太阳的大部分氢会聚合成较重的氦,氦需要更高的温度,才能聚合成碳,因氦较重,其引力会更强,使太阳中心压力加高,当气体压力增高时,按气体定律,温度就会自动提高,当太阳大部分是氦时,其中心温度会增高到现在的10倍,达到一亿度时,氦就聚合成更重的碳,然后因引力会产生更高的温度而将碳聚合成氮.如此重演累进到氧等更重的物质,一直到铁,在高温中,所有物质都成为气体.

f[f﹙-1﹚]=f(a-1)=a^3-2a^2+a-1=-1
所以a^3-2a^2+a=0
a=0或者1
题目说明a为正数,所以a=1

答案是【不确定事件】
如：5既不是2的倍数,也不是3的倍数
6即是2的倍数也是3的倍数
所以：你取的这个数不一定是2的倍数,或是3的倍数
即：原题是不确定事件

烯烃在ROOR时与HBR是自由基加成,不是自由基取代.的确会反马.
炔烃,一样
只要不涉及CF3-这样的基团,就按照常规的H扎堆的原则去判断马氏就行

1.Because the changes in the internal and external environment,inevitable the implementation of the programme will bring some uncertain factors
2.Because the changes in the internal and external environment,inevitable the implementation of the programme will bring about some

求导,对导数=0求值,如果其结果不在区域内就是单调的,如果在给定区域中,那就不是单调的,大于0时单调增,小于0时单调减

1 已知三边求出面积S
P=(a+b+c)/2=24
s^2=p*(p-a)*(p-b)*(p-c)=24*14*3*7=7056
S=84
2 设BC边上的点D,AD垂直于BC,则AD为BC边上的高
3 则 BC*AD/2=84
4 AD=8
高为8

这里所说的波动性,主要是根据光的波粒二象性,相对于粒子性定义的.
光的波长约长,其波动性越显著,粒子性越弱.反之亦然.
记住这个结论就好.

红外光谱观察是否有相应的官能团,还有既然是氯乙酸,那么通过水解,酸化,滴加硝酸银溶液即可观察现象白色沉淀

1.A
2.C
3.B
第二题有些矛盾,要是后半句是could not的话选C更为合适,而且选C更合句意.而且如果是A,不应该是would.个人认为题有问题.

4m+2x≤12mx-3 （12m-2）*x≥4m+3
x≥（4m+3）/（12m-2）=3/4
m=0.9

平行

If I am doomed ordinary, I can treat as it the gracious gift whichascends the sky but helpless thanking, is ordinary until death Ifthat is doomed to include one not to be that indefinite, I am willing...

浣犺嚜宸辨參鎱㈡敼 .
Ming Ming Tombs located in Changping District of Beijing Tianshou foothills,East and West,North San Mianhuan Hill,is the world's more integrity and preservation of the emperor buried up to the tomb group.
闄靛尯area of about 120 square kilometers.The mountains,the Mausoleum of both surface water and mountain building,the layout solemn harmony.Yongle Emperor Zhu Di of the Changling Jianyu Ming Wing-lok 2007 (1409 AD),is the first tomb闄靛尯,Shoushan in the days before the main peak.
After construction of the Ming Dynasty Emperor Renzong Xianling,Xuanzong King Mausoleum,Yingzongyuling,Xianzongmaoling,Xiaozong Tailing,Kang Ling Wu-Tsung,Sejong Yongling,Muzongzhaoling,Shenzong Ding Ling,the first Zong Qing Tombs,Muzong,such as Germany Mausoleum 11 were located in Changling Tomb on both sides of the foot of the mountain.
闄靛尯up to seven kilometers of the central Changling Shinto (the ISF) and the Mausoleum of the same.
Chongzhen Di Zhu Ming Si from the seizure of the Mausoleum is the last one tomb,located in闄靛尯Xinan Yu,Princess of switching to grave,the first year-Shunzhi (Year 1644) before Ding Ling,and the construction of additional floor.
In addition,the Mausoleum of the region also has a seven graves Fei Ming Dynasty,the tomb of a eunuch,and had built a palace,Yuanyou,and other ancillary buildings,was built around 10 customs City.
Castle Peak surrounded here,beautiful scenery,in a radius of about 40 square kilometers of small basin,Cuolayouzhi distribution of 13 emperors of the Ming Dynasty tomb,later known as the Ming Tombs.Now here has become a well-known to the world tour.
As the tomb area is too high,the general visitors a tour of the two main mausoleum,a building specifications is the most magnificent Zhang Ling,an underground palace was discovered by Ding Ling.Imperial Mausoleum every one has an underground palace,but only uncovered the Dingling this.Visitors enter the cemetery,first of all be arranged in 18 pairs on both sides of the road and Shishou Shirengou are interested.
These huge Shiren,Shishou,Diaogong Fine,modeling vivid,is precious ancient art.They also said that after the death of the emperor and his master all the same.These huge stone carving,and some volume of more than 30 cubic meters is the use of days by splashing water into ice on the road,the statue will be placed on ice to the Road haulage here.
Zhanglingchangling grand scale is the third Ming Dynasty emperor Yongle Emperor Zhu Di's tomb,the main construction Prism TU Hall,and the National Palace Museum in Taihe Dian like,a total area of 1,956 square meters.It is more prominent than the Taihe Dian,which is its columns,beams,PURLIN,Chuan and Yantou all use nanmu,Diannei the 32 Juzhu,with the whole roots are made of wire nanmu.It is said that at that time just from the origin of these huge nanmu transported to the cemetery,spent 56 hours.This thick of nanmu,nanmu this magnificent building,in the country,is the only no,so this is the palace is particularly valuable.
When Zhu Di of the 22 emperors,he Cheng Di in the first six years of starting construction on the tomb,the sharing of five years.
Magnificent Ding Ling Ding Ling is the underground palace of the Ming tombs Shenzong.Ming Shenzong reign 48,the emperor of the Ming Dynasty when the longest one.He repair the tomb for six years.According to records,consuming a total of two silver over 800 million,equivalent to two years at the time of the Tianfu income.Ding Ling Zhang Ling as the size,but its construction is more refined.Dingling most of the ground building no longer exists,but also that the floor intact.Because that is all the stone floor,Xu,not a wood,so it not only strong but also fire.Ming House,the building was also reflected the high level of design and construction.Dingling level of the construction may have been excavated from the Degong seen.Ding Ling magnificent underground palace from the ground 27 meters,a total area of 1,195 square meters,five tall and spacious hall is all stone structure,Gongquan-top,not a column.Ming Emperor Shenzong and placed two of the coffin of the Queen's Houdian,as high as 9.5 meters,30.1 meters long,9.1 meters wide,is the largest of the palace.Here to explore the more than 3,000 pieces of funerary objects,including Golden Delicious,Jinhu,the Grand Mercure,Fengguan,such as an extremely valuable cultural relics.Golden Delicious is compiled by Watkins,the highest top-a pair of dragon.Fengguan on more than 100 pieces inlaid with precious stones,pearls more than 5,000 stars.Visitors can see these Dingling museum treasures.
Zhaoling in ninth place in the Ming Tombs,the 12th emperor of the Ming Dynasty and his three Queen He Zangmu,Zhaoling the building has its own unique place.Ming Ming Tombs in the ground is building the most complete and most representative of Lingqin construction.

那就按书上的,不用搅拌,我们要一切以教科书为准,毕竟现在学习还是为了考试,标准答案肯定是以书本为准.

PI是指投产后按设定折现率或基准收益率计算的各年净现金流量现值合计与原始投资的现值合计之比.PI＝1+NPVR
NPVR（净现值率）＝NPV/原始投资的现值合计
三者的关系：
如果NPV=0,则PI=1,NPVR＝0
如果NPV>0,则PI>1,NPVR>1
如果NPV

Concrete is the world of construction materials in the range of one,but because of their brittleness,poor durability,the characteristics of crack width of uncertainty will lead to project structure deterioration,durability,reduce,or even cause structural damage and ultimately shorten the service life .High-performance cement-based thin layer of protection as the concrete structure can reduce the traditional template of labor,improving the strength of concrete structure,the appropriate volume fraction of fiber can significantly improve the resilience of structures to enhance the durability of building materials and life.This article uses the different types of admixtures to replace proper cement,cement-based composite sheet prepared by high-performance; and identify the different admixtures of different fiber content,as well as thin as a protective layer of concrete when the different surface treatments,replace the concrete of different thickness on the performance of composite beams.

时间、空间、物质都是人类的错觉！只有一样是不变的，就是能促使万物变化的那个东西！

1、Can I ask you a question of math homework?
2、I'm not sure,let me check my notes.
3、The art room is next to the computer room.
4、I don't know the word,can I use your dictionary?
5、I can lend you my notebook
6、Can I help you?Yes,please help me to take these books
7、Thank you very much.Not at all.

是主谓短语哦
主谓短语：主语是陈述的对象（往往是名词、代词）,谓语是陈述的内容（往往是动词、形容词）,或者可以还原成……是…….这句话实际就是“今天（是）周二”
示例：上帝死了 脑袋晕
并列短语是指词和词之间表示并列关系.也就是可以在词语和词语之间加上“和、或、又……又……”之类的并列连词
比如说：调查研究 、又说又笑 风雨雷电 提高或降低

定滑轮 F=G物
S=h F：绳子自由端受到的拉力
G物：物体的重力 S：绳子自由端移动的距离 h：物体升高的距离
动滑轮 F= （G物+G轮）
S=2 h G物：物体的重力 G轮：动滑轮的重力
滑轮组 F=（G物+G轮）
S=n h n：通过动滑轮绳子的段数
机械功W（J） W=Fs F：力 s：在力的方向上移动的距离
有用功W有
总功W总 W有=G物h W总=Fs 适用滑轮组竖直放置时
机械效率 η= ×100%
功率P（w） P=W/t W：功 t：时间
功 W J焦耳（焦） W=Fs
功率：P 瓦特（瓦） w P=W/t
电流：I 安培（安） A I=U/R
电压：U 伏特（伏） V U=IR
电阻：R 欧姆（欧） R=U/I
电功：W 焦耳（焦） J W=UIt
电功率：P 瓦特（瓦） w P=W/t=UI

We are the World 英文歌词:We Are The World Written by Michael Jackson and Lionel Richie There comes a time when we heed a certain call When the world must come together as one There are people dying A...

1.She did not attend class yesterday.Probably she is sick.I am not sure.
2.A:What are John doing?
B:Probably he is packaging.
3.Why does he late yesterday?He might be busy.
1) may be
2) might be visiting

对
概率是确定的 ,频率是不确定的
在实验次数很大时,频率趋向概率

因为 NaOH+HCl=NaCl+H2O,NaCl一定有!但可能氢氧化钠盐酸可能过量,
选A ,可用2种方法：
一：排除法：因为B种物质鉴别不了盐酸是否过量,但可鉴别氢氧化钠是否过量,C,D氢氧化钠和盐酸都鉴别不了是否过量,（无现象）,故选B .
二：正选法：无色酚酞可鉴别氢氧化钠是否过量,若变红则氢氧化钠过量,若不变红,再加入碳酸钠溶液,有气泡产生则盐酸过量,若无则恰好反应.
纯手打 .

若两个相似三角形的面积比为4:3,则它们对应高的比是（A,2:√3 ）
A,2：根号3 B 不确定

失败+经验+努力+机遇=成功

1.C
2.B
3.The boys in our class haven't got any felt pens

该函数对称轴为-a/2；
当-a/2=0时,x=0取最小值3,x=1取最大值a+4；
当0

It's no use to say anything anymore!
一切都走了 - Everything's gone.
All has gone似乎不太对...

火星.没错了,我以前也问过这个问题

i am not sure.
take 15 minutes by+交通工具
it is easy to arrive at school
be afraid of doing sth
he treats me like my father
it isn't a bridge here
nearest mail
distance taking by bus
long journey
kilometer
pass
alive
cross
many

a couple of
两个, 几个
例句:
He patched up a couple of old tires.
他补了几条旧车胎.
The bowler let go a couple of scorchers.
投球手投出了几个快球.
Give the bottle a couple of shakes before pouring the juice.
倒果汁前,先把瓶子摇几下.

不放设这个数为a,根据题设|a|>a
如果a≥0,|a|=a与题设矛盾
如果a

现在在国内已经不叫London力了.现在叫它色散力,属于Van De Waals力（范德华力）的一种.从强弱上来讲是属于次级键（就是比化学键若许多的一种力）.
至于和元素周期表的关系完全可以和原子半径的大小有关.可以形象的理解,原子半径越大就越容易发生形变,因为核外电子云分布更大,所以受外电场就能造成更大的影响.那么电子所受的回复力（即偏离原轨道范围而力图恢复的力）就越大.如果核外电子越多,发生变形的几率就会更大,那么整体上形变的程度会由于共振的影响加强.在元素周期表中就可以理解为原子半径越大的元素的色散力就越大,原子核外电子越多的电子色散力就越大.

这个应该是逻辑问题,我觉得对于天气预报来说,肯定是“不确定事件”.即使从语句上来说,“明天是晴天”好像就是必然事件,但具体到实际问题中来或者生活中来,既然是预报,肯定是概率事件,也就是不确定事件了.这么解释不知道对不对?

1.做大量的清洁
第二个你打错了吧
3.动动脑子
4.大声读这个
5.同意做某事
6.有关活动
7.浪费我的时间
8.分发
9.Praise his speech
10.Had lost the election
11.Promise
12.Preparing dinner
13.Care for
14.Improve their lunch Cookbook
15.Give advice
16.Lost their watches

无所事事的“事事”中,第一个事是动词,当做事讲,第二个事是名词,是事情的意思.
“事是”中的“事”是名词：事情,“是”是副词：“就是,是指”的意思.“事是”就是“事情是.”
“是事”中的“是”是做“这个”讲,而“事”仍然是名词“事情”的意思.“是事”就是“这件事”.

东方
地球自西向东转动.
太阳不东.
你说太阳从哪里生气：（

不确定原理导致的基态起伏,只是从微观上的观测来说的,在宏观上统计学的角度看,这些涨落会被平衡掉,并得到一个稳定的数值.
不确定原理在定义上是指,一个微观粒子的位置和动量,或时间和能量,不可能同时精确测量.一个量测量越精确,则另一个量的不确定程度就越大.
这个定理的本初是个实验观测的规律.因为你如果要观测一件物体,你需要先向物体打上某种光,然后肉眼或者观测仪器去探测这种光的反射,对吧.观察微观粒子也类似.你需要给微观粒子至少一个光子,来探测他们相互作用的结果.但是,光子是有波动性的.如果要测量得越精确,光子的波长越短,要求光子能量越高.如果光子能量比较高,那与粒子相互作用之后,粒子动能变化就比较大,速度就越不确定.所以位置和速度不可能同时无限精确,这就是不确定性原理的最本初的产生.
注意,这里面提到的都是不确定度,而不是绝对值.即对于能量来说,有
△E△T≥h/2π,其中△E是能量不确定度,△T是时间不确定度.但是注意 能量值是由 E=E0±△E,组成的,而其中E0是确定的,△E不确定.所以可以这么讲,统计平均值是确定的,但是误差度会有大小.所以,宏观上统计上来讲,能量不会平白多出来,或者减少,只是细节上不确定性增加了,平均值还是稳定的.
总结一下,不确定性不会带来能量不守恒,只是微观上的一些涨落而已,均值仍旧是确定的.都是自己写的,语言不好,希望你能看明白.

2

加盐酸可排除Ag+、SO32-、CO32-离子的干扰
而加硝酸会把SO32-氧化成SO42-
所以只能加盐酸