题目:
He never chats with others. He always ______ everything to himself. [ ]
A. keeps
B. lets
C. makes
D. says
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:由题意知,该电场不一定是匀强电场,得c点的电势不一定为5 V,A错;因不知ab两处电场线的疏密程度,无法确定ab两处场强的大小,B错;因,正电荷从a点运动到b点过程中电场力做负功,其电势能一...