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【多選題】
下列關于運動物體所受合外力做功和動能變化的關系正確的是（ ）
A.
如果物體所受合外力為零，則合外力對物體做的功一定為零
B.
如果合外力對物體所做的功為零，則合外力一定為零
C.
物體在合外力作用下做變速運動，動能一定發生變化
D.
物體的動能不變，所受合外力一定為零
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舉報參考答案：
舉一反三
【單選題】You will find this map_______________ great value in helping you to get around London.
A.
in
B.
at
C.
of
D.
with
【單選題】Is this the girl_____________________ whom I can turn for help? Is she good at this subject?
A.
to
B.
with
C.
in
D.
at
【單選題】This selection says that Thomas Edison ________.
A.
was the only important American inventor
B.
received the first American patent
C.
received more patents than any other American
D.
was the first American inventor
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【單選題】You will find this map_______________ great value in helping you to get around London.
A.
in
B.
at
C.
of
D.
with
【單選題】Is this the girl_____________________ whom I can turn for help? Is she good at this subject?
A.
to
B.
with
C.
in
D.
at
【單選題】This selection says that Thomas Edison ________.
A.
was the only important American inventor
B.
received the first American patent
C.
received more patents than any other American
D.
was the first American inventor
參考解析：
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