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【判断题】
在HAc溶液中加入NaAc将产生同离子效应，使[H+]降低；而加入HCl也将产生同离子效应，使[Ac-]降低A.
正确
B.
错误
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皮皮学刷刷变学霸
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【简答题】_______ we are doing now has never been done before. A．That B．What C．Which D．Whether
【单选题】Hi, Bob. How are you doing? It has been a long time _____ we left our junior middle school.
A.
when
B.
that
C.
before
D.
since
【单选题】听力原文：M: What are you doing? W: We are protesting against the odor that has been coming from your factory. M: You don't have to do this. Why didn't you just call me and arrange an appointment? I'm very...
A.
The profit- activities of the company.
B.
The smell coming out from the factory.
C.
The suggestions made by the factory.
D.
The refusal of an appointment with the protesters.
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