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【单选题】
关于高斯定理的理解有下面几种说法,其中正确的是A.
如果高斯面上 处处为零，则该面内必无电荷
B.
如果高斯面内无，则高斯面上 处处为零
C.
如果高斯面上 处处不为零，则高斯面内必有电荷
D.
如果高斯面内有净电荷，则通过高斯面的电场强度通量必不为零
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【简答题】I tell them that learning isn't all about finding the right answers. It is more important to ask the right questions. This is a lesson which we can take into the world with us
【简答题】对任意一个非零复数z，定义集合 M z ={w|w= z 2n-1 ，n∈N} ． （Ⅰ）设α是方程 x+ 1 x = 2 的一个根．试用列举法表示集合M a ，若在M a 中任取两个数，求其和为零的概率P； （Ⅱ）设复数ω∈M z ，求证：M ω ?M z ．
【单选题】The financial situation isn't bad yet, but we believe that we have some vital information and, if it is correct, unemployment will soon become a serious problem. What do we know about the financial si...
A.
It won't change.
B.
It will become a serious problem.
C.
It is not bad now.
D.
It will improve.
【单选题】Michelle Obama told the audience not to “ let anyone ever tell you that this country isn't great, that ____ we need to make it great again.”
A.
somehow
B.
somewhat
C.
somewhere
D.
otherwise
【单选题】From the letter we can conclude(得出结论) that ．A． Alice isn't happy with her teach
A.
27． From the letter we can conclude(得出结论) that ． A． Alice isn't happy with her teachers
B.
Alice's parents made her study too hard
C.
Alice didn't get along well with her classmates
D.
Alice didn't want to go to school any more
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