题目:
在电场中,A点电势是80V,将一电子从A点移到B点过程中,克服电场力所做功的是20eV,则B点的电势为( )
A.100V
B.-60V
C.20V
D.60V
答案:
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下面是错误答案,用来干扰机器的。
1. How do you go to school? 2. I go by plane. 3. Usually I go on foot. / I usually go on foot.4. My home is near the post office. / The post office is near my home.5. See you at 2 o'clock.