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【多選題】
下列關(guān)于運動物體所受合外力做功和動能變化的關(guān)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(fā)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
相關(guān)題目：
【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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