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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，则下列说法正确的是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 ¹ mB 时，该两质点的动量也可能相等
C.
当 vA ¹ vB ，且 mA ¹ mB 时，该两质点的动量有可能相等
D.
当 vA ¹ vB ，且 mA ¹ mB 时，该两质点的动量必不相等
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皮皮学刷刷变学霸
举一反三
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A.
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B.
护士与其他医务人员的关系
C.
护士与其家人的关系
D.
护士与社会的关系
E.
护士与护理科学及医学科学的关系
【简答题】PART I DICTATION [10 MIN] Listen to the following passage. Altoget...
【单选题】Since William had been seriously for several months, his parents were worried about __________ to return to school full-time.
A.
he wanted
B.
him to want
C.
he wanting
D.
his wanting
【单选题】Since William had been seriously ill for several months, his parents were worried about ________ to return to school full-time.
A.
he wanted
B.
he wanting
C.
him to want
D.
his wanting