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【单选题】
关于电场中任意两点的电势与电势差之间的关系,下列说法中正确的是( )A.
若一点的电势为零，电势差也一定为零
B.
若一点的电势为零，电势差也可以很大
C.
电势均为正时，电势差也一定为正
D.
电势均为负时，电势差也一定为负
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举一反三
【单选题】Tom insisted _____ history instead of business at university, but his mother insisted that he _____ her advice. [ ]
A.
on studying, take
B.
to study, must take
C.
on studying, took
D.
in studying, should take
【单选题】His government insisted that he ______until he finished his degree.
A.
would stay
B.
stay
C.
stayed
D.
shall stay
【单选题】His friends insisted that Tony ______ nothing to do with drugs and they insisted that he ______ free immediately.
A.
have, be set
B.
had, was set
C.
had, be set
D.
have, was set
【单选题】Both of his parents insisted that he _______ get on well with his lessons and that he ______ given more extra classes at weekends.
A.
didn’t; be
B.
didn’t; was
C.
doesn’t; should be
D.
didn’t; would be
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