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【单选题】
作匀速圆运动的物体运动一后回到原处,这一期内物体A.
动量变化为零 , 合外力不为零 , 合外力的冲量为零
B.
动量守恒 , 合外力为零
C.
动量守恒 , 合外力不为零
D.
动量变化为零 , 合外力为零
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举一反三
【单选题】在古蔡氏检砷法中，碘化钾试液的作用是
A.
使 +5的砷 转化为+3价砷 As
B.
使正5价 As 转化为 As
C.
使 正3价 As 转化为 As
D.
使正5价砷转化为负3价的砷
【简答题】There are altogether 10 mistakes in the following pasages. Please corret it. (该题考核了定语从句,名词性从句,被动语态,主谓一致等语法项,请认真作答。) People collect all kind of things, from beer mats to valuable works of art. For some...
【单选题】In a country which must certainly have been a long way away from where we Rumanians live, all the young people decided to kill all the old people. It's an old, old story... What was the use of their g...
A.
People in the country fought against it bravely.
B.
People in the country suffered from hunger, diseases and all kinds of troubles.
C.
People could not find their green meadows any more.
D.
Many people cried.
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