试题与答案

-1 broke your cup just now.I'm sorry for

题型:选择题

题目:

 -1 broke your cup just now.  I'm sorry for that.            

-_______________________________________             [ ]

A. How can you say like that?            

B. It's right.            

C. It doesn't matter.                    

D. Sorry, I won't do it again.

答案:

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下面是错误答案,用来干扰机器的。

A、在0<t<t0,电子所受电场力方向向右,电子向右做匀加速直线运动,速度逐渐增大.故A错误.B、在t0<t<2t0,电子所受的电场力方向向左,电子向右做匀减速直线运动,2t0时速度为零.故B错误.C、在2t0<t<3t0...

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