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【判断题】
质点系的动量守恒,意味着该系统中一部分质点的速率变大时,另一部分质点的速率一定会变小。
A.
正确
B.
错误
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A.
I learn English for the people
B.
I don't like English
C.
I learn English by working with some students
D.
I also like English
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It offers special discount prices.
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It promotes certain products and stores.
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It concentrates on the image of the company.
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A.
a English book
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an English book
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A.
I have felt
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have I felt
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I did feel
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did I feel