问题
选择题
The computer system _____ suddenly while I was surfing the Internet. [ ]
A. broke down
B. broke out
C. broke up
D. broke in
答案
A
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The computer system _____ suddenly while I was surfing the Internet. [ ]
A. broke down
B. broke out
C. broke up
D. broke in
A
的
、
两点处分别固定着两个等量正电荷，a、b是
连线上两点，其中
=
=
,
带电量为+
的小滑块(可视为质点)以初动能
从a点出发，沿
倍(
；
两点间的电势差
；