新版输气工（初级）

AD004带正电的小球只受电场力作用 ,则它在任意一段时间内() 。

发布于 2021-04-19 22:41:41

【单选题】
A 一定沿着电场线由高电势向低电势方向运动
B 一定沿着电场线向电势能减小的方向运动
C 不一定沿着电场线运动 ,但一定向低电势方向运动
D 不一定沿着电场线运动 ,也不一定向电势能减小的方向运动

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yingang3344 2023-04-19

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