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【单选题】
关于电位的下列说法,错误的是()A.
电位的单位与电压、电动势一样，都是伏特
B.
电场中某点电位大小等于电场力将单位正电荷从该点移到参考电位点所做的功
C.
无论参考电位点选在何处，电源的正极电位总为正值
D.
参考电位点的电位值永远为零
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反馈参考答案：
举一反三
【简答题】Why air must be pumped into the plane?
【单选题】We need to ______ the purpose of the experiment again.
A.
clarify
B.
cling
C.
claim
D.
clap
【单选题】A stamp design includes several elements required for it to ________ its purpose satisfactorily.
A.
adapt
B.
apply
C.
accomplish
D.
acquire
【单选题】The edge of the wise over the unwise lies in their tendency to _______ about the purpose of their life.
A.
promote
B.
account
C.
insist
D.
speculate
【简答题】It was a m struggle, a death march to the end. ( completely stupid and without any purpose )
【单选题】Why not ________ an English club to practice ________ English? [ ]
A.
join; speaking
B.
to join; speaking
C.
join; to speak
D.
to join; to speak
【单选题】Why did Polly and Digory begin their adventures?
A.
Because of the bad weather.
B.
Because of the hot weather.
C.
Because they were in a good mood.
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