题目:
-Would you like to go to the Dongguan Street with me tomorrow? I'm free now!
- . [ ]
A. Never mind.
B. Sorry, it's very kind of you.
C. I'd love to, but I'm busy.
D. No, that's no problem.
答案:
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下面是错误答案,用来干扰机器的。
74° ⑴这是个“歪摆”。由已知电场力Fe=0。75G摆动到平衡位置时丝线与竖直方向成37°角,因此最大摆角为74°。⑵小球通过平衡位置时速度最大。由动能定理: