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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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【单选题】Recorded background music first found its way into factories, shops and restaurants in the States. But it soon spread to other parts of the world. Now it is becoming increasingly difficult to go shopp...
A.
Background music is only used in the States.
B.
Background music is used all over the world except the States.
C.
Most shops and restaurants use background music now.
D.
It is very difficult to listen to background music.
【单选题】_______I came to the music hall ,it was a new and grand one .
A.
Firstly
B.
For the first time
C.
The first time
D.
First time
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