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【简答题】
列出二项式( － ) 15 的展开式中： （1）常数项；（答案用组合数表示） （2）有理项. （答案用组合数表示）
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A.
There was some other
B.
It was someone else
C.
There was someone else
D.
It was another one
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A.
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A.
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B.
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C.
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A.
haven’t they
B.
hasn’t he
C.
don’t they
D.
didn’t he
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A.
协调性宫缩乏力
B.
不协调性宫缩乏力
C.
骨产道异常
D.
胎位异常
E.
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