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【单选题】
质量分别为ma和mb（ma：≠mb），速度分别为Va和Vb （Va≠Vb）的两质点a和b，受到相同的冲量作用，则质点（）A.
a动量增量的绝对值比b小
B.
a动量增量的绝对值比b大
C.
a、b的动量增量相等
D.
a、b的速度增量相等
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举一反三
【简答题】OSI 参考模型中提供可靠的端到端服务的是_________层。
【单选题】Section B Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you ...
A.
Whether we can develop social lies on the Internet.
B.
Whether a deleted photo is immediately removed from the web.
C.
Whether our blogs can be renewed daily.
D.
Whether we can set up our own websites.
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【单选题】38 What does Akins do?
A.
She is a soldier.
B.
She is an accountant
C.
She is a saleswoman.
D.
She is a road sweeper.
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