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【单选题】
选无穷远处为电势零点,半径为R的导体球带电后,其电势为 ,则球外离球心距离为r处的电场强度的大小为 ( )A.
;
B.
;
C.
;
D.
。
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举一反三
【单选题】If one thing is _______ another, it is on the other side of a space from it
A.
focus
B.
image
C.
input
D.
Opposite
【简答题】If one thing __________ with another, it is very different from it.
【单选题】If one thing ____ another, an electrical or magnetic force pushes them apart.
A.
expels
B.
repels
C.
exceeds
D.
exclaims
【单选题】If one thing _______s into another, it is changed into a different form.
A.
loyalty
B.
preserve
C.
incentive
D.
reservoir
E.
convert
【简答题】“误入尘网中 ”采用 (修辞)。
【简答题】“误入尘网中,一去三十年”采用什么修辞手法?
【简答题】If one thing p_________ another, they happen at the same time or are similar.
【单选题】If one thing is an to another, the first can be found, used, or done instead of the second. What is it?
A.
Hydroelectric.
B.
Sources.
C.
Electricity.
D.
Alternative.
【单选题】If one thing______another, the first is certain to cause the second thing to happen.
A.
guarantees
B.
browses through
C.
lets out
D.
dominates
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