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【單選題】
下列關(guān)于運動物體所受的合外力、合外力做功和動能變化的關(guān)系正確的是：（ ）
A.
如果物體所受的合外力為零，那么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作變速運動，動能一定變化
D.
物體的動能不變，所受的合外力必定為零
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舉報參考答案：
舉一反三
【單選題】You ________ last week if you were really serious about your work.
A.
ought to come
B.
ought to be coming
C.
ought to have come
D.
ought have come
【單選題】The wine made _____China is made ____rice,but its bottle is made____glass.
A.
in; from; of
B.
in; of ; from
C.
of; from; in
D.
from; of; by
【單選題】According to Rule 7, Bill Gates advises __________.
A.
the youth to save the rain forest
B.
parents to stop helping their children
C.
young people not to blame (歸咎) too much on their parents
D.
young people to delouse the closet in their own rooms
【單選題】I didn’t see her in the meeting room. She _________ at the meeting.
A.
mustn’t have spoke
B.
shouldn’t have spoken
C.
needn’t have spoken
D.
couldn’t have spoken
【單選題】Bill Gates would probably agree with the following statements EXCEPT that __________.
A.
even mistakes can help
B.
since life is unfair, there’s no need to fight
C.
your boss is usually much stricter than your teacher
D.
only through taking pains will you enjoy a big success
相關(guān)題目：
【單選題】You ________ last week if you were really serious about your work.
A.
ought to come
B.
ought to be coming
C.
ought to have come
D.
ought have come
【單選題】The wine made _____China is made ____rice,but its bottle is made____glass.
A.
in; from; of
B.
in; of ; from
C.
of; from; in
D.
from; of; by
【單選題】According to Rule 7, Bill Gates advises __________.
A.
the youth to save the rain forest
B.
parents to stop helping their children
C.
young people not to blame (歸咎) too much on their parents
D.
young people to delouse the closet in their own rooms
【單選題】I didn’t see her in the meeting room. She _________ at the meeting.
A.
mustn’t have spoke
B.
shouldn’t have spoken
C.
needn’t have spoken
D.
couldn’t have spoken
【單選題】Bill Gates would probably agree with the following statements EXCEPT that __________.
A.
even mistakes can help
B.
since life is unfair, there’s no need to fight
C.
your boss is usually much stricter than your teacher
D.
only through taking pains will you enjoy a big success
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