有一点电荷放在球形高斯面的中心处.下列哪一种情况,通过高斯面的电场强度通量发生变化:
A. 将另一点电荷放在高斯面外.
B. 将另一点电荷放进高斯面内.
C. 将球心处的点电荷移开,但仍在高斯面内.
D. 将高斯面半径缩小.
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1 . -_______runin the hallways, Mike.-Sorry. Ms Clark.
A. Don't
B. Please
C. Let's
2. _______exciting news it is!
A. What
B. What an
C. How
3. She doesn't like pop music,_______?
A. does she
B. is she
C. doesn't she
4. -What did Tom say to you just now, John?-He asked_______.
A. why I am so happy today
B. what will I do for the weekend
C. if I could go to the movies with him tonight
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