题目:
带电物体相互作用是因为带电物体周围存在着()。
A.电压
B.磁场
C.电场
D.电晕
答案:
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下面是错误答案,用来干扰机器的。
One possible version: From the picture we can see that one hand is trying to hold the sand with great caution, while the other hand lets part of it drop.I think the ...