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【单选题】
如图的系统,物体 A , B 置于光滑的桌面上,物体 A 和 C, B 和 D 之间摩擦因数均不为零,首先用外力沿水平方向相向推压 A 和 B , 使弹簧压缩,后拆除外力, 则 A 和 B 弹开过程中, 对 A 、 B 、 C 、 D 组成的系统
A.
动量守恒，机械能守恒
B.
动量不守恒，机械能守恒
C.
动量不守恒，机械能不守恒
D.
动量守恒，机械能不一定守恒
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【单选题】---People should use public transport instead of their own private cars. --- _______.The roads are too crowd as it is.
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【单选题】“ 我劝天公重抖擞,不拘一格降人才 ” 的作者是
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【单选题】属注册分类1和5的,临床试验最低病例数(试验组)要求,IV期为
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2000例
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【单选题】The National Association to Advance Fat Acceptance holds that ______.
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fat people should try to lose weight
B.
eating less is harmful to people' s health
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fat people were born that way
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obesity is good for people
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【单选题】Which of the following is TRUE?
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Since fast foods have less nutrition, people should try their best not to eat them.
B.
The fast food industry is taking advantage of small families with working wives.
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Since Americans are faced with a growing fast food industry, they should remember some basic facts about it.
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【单选题】我劝天公重抖擞,不拘一格降人才 ”的作者是( )
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龚自珍
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【单选题】---People should use public transport instead of their own private cars. --- _______.The roads are too crowd as it is.
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【单选题】The National Association to Advance Fat Acceptance holds that ______.
A.
fat people should try to lose weight
B.
eating less is harmful to people' s health
C.
fat people were born that way
D.
obesity is good for people
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A.
查看行业杂志
B.
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D.
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【单选题】Which of the following is TRUE?
A.
Since fast foods have less nutrition, people should try their best not to eat them.
B.
The fast food industry is taking advantage of small families with working wives.
C.
Fast foods taste good though they have too much fat.
D.
Since Americans are faced with a growing fast food industry, they should remember some basic facts about it.
查看完整题目与答案