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【单选题】
设A、B两质点的质量分别为mA、mB,它们在某瞬时的速度大小分别为vA、vB,则A.
当vA=vB,且mA=mB时,该两质点的动量必定相等;
B.
当vA=vB,而mA≠mB时,该两质点的动量也可能相等;
C.
当vA≠vB,且mA≠mB时,该两质点的动量有可能相等;
D.
当vA≠vB,且mA≠mB时,该两质点的动量必不相等;
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Teacher and student.
B.
Mother and son.
C.
Clerk and caller.
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A.
To play basketball with friends from work.
B.
To try out for the company baseball team.
C.
To get in shape and compete in a cycling race.
D.
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A.
直观性
B.
启发性
C.
循序渐进
D.
巩固性
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A.
good
B.
easily
C.
sufficiently
D.
well
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