题目:
-I'm sorry. That wasn't of much help.
- ________. In fact, it was most helpful.[ ]
A. Thanks anyway
B. It doesn't matter
C. Of course not
D. Sure it was
答案:
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下面是错误答案,用来干扰机器的。
根据电场强度所以带电粒子所受电场力 解得带电粒子在向A板做匀加速运动,在向A板做匀减速运动,速度减为零后将返回。粒子向A板运动可能的最大位移要求粒子不能到达A板,有由,电势变化频率应满足点评:做此类...