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供热收费“大锅饭”体制的弊端包括()。

A、费用与实际用热无关(浪费)
B、室内无调节手段(被动浪费)
C、供热公司收费难
D、不利于提高经济效益，垄断掩盖竞争

【参考答案】

A,B,C,D

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基因工程药物按生理功能和用途可以分为哪几类?()

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