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【多選題】
電量為q的點電荷，在兩個固定的等量異種電荷+Q和-Q的連線的垂直平分線上移動，則：（ ）
A.
電場力做正功
B.
電場力做負功
C.
電場力不做功
D.
電場力做功的正負，取決于q的正負
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舉報參考答案：
舉一反三
【單選題】Every person needs water and a diet of healthy food ______some fat, some fibre and a little salt .
A.
gaining
B.
containing
C.
keeping
D.
including
【單選題】He insisted he_ _ ill , but I suggested medical care_ ____to him .
A.
wasn’t/was given
B.
was/was given
C.
wasn’t/be given
D.
was/should given
【單選題】He apologized ________ late.
A.
to his teacher to arrive
B.
at his teacher for arriving
C.
at his teacher to arrive
D.
to his teacher for arriving
相關題目：
【單選題】Every person needs water and a diet of healthy food ______some fat, some fibre and a little salt .
A.
gaining
B.
containing
C.
keeping
D.
including
【單選題】He insisted he_ _ ill , but I suggested medical care_ ____to him .
A.
wasn’t/was given
B.
was/was given
C.
wasn’t/be given
D.
was/should given
【單選題】He apologized ________ late.
A.
to his teacher to arrive
B.
at his teacher for arriving
C.
at his teacher to arrive
D.
to his teacher for arriving
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