税收具有强制性、无偿性、固定性的形式特征,其核心是(  )。

税收具有强制性、无偿性、固定性的形式特征,其核心是(  )。A.强制性 B.固定性 C.确定性 D.无偿性

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Weight loss is also bad for your bones.

Weight loss is also bad for your bones.A.Right B.Wrong C.Not mentioned

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Most women also think that osteoporosis is a woman's disease

Most women also think that osteoporosis is a woman's disease.A.Right B.Wrong C.N

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一个水池有两个排水管甲和乙,一个进水管丙。若同时开放甲、丙两管,20小时可将满池水排空;若同时开放乙、丙两水管,30小时

一个水池有两个排水管甲和乙,一个进水管丙。若同时开放甲、丙两管,20小时可将满池水排空;若同时开放乙、丙两水管,30小时可将满池水排空;若单独开丙管,60小时可

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有如下程序: #include<iostream>using namespace std; class Base{p

有如下程序: #includeusing namespace std; class Base{public: void f

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