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【单选题】
质心运动定律描述的是:
A.
是关于质心的动量守恒定理
B.
质心和所有质点遵循的规律
C.
质点系中所有质点所遵循的规律
D.
质点系的质心所遵循的定律
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A.
正确
B.
错误
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A.
河姆渡文化
B.
半坡文化
C.
仰韶文化
D.
牛河梁遗址
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A.
which
B.
when
C.
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D.
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B.
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words
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A.
won't pay; is
B.
doesn't pay; is
C.
won't pay; will be
D.
doesn't pay; will be
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A.
won’t pay, is
B.
doesn’t pay, is
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won’t pay, will be
D.
doesn’t pay, will be
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