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问题 选择题
向纯水中加入少量NaHS04固体，当温度不变时，则该溶液中（   ）

A．水电离出的c（H+）减小

B．c（OH-）与c（H+）的乘积增大

C．c（H+）减小

D．c（OH-）增大

答案

答案：A

单项选择题


Which of the following most probably means what you hear

A．Everybody has opportunities if he is ready for them.

B．Some people have opportunities and are ready for them.

C．All people have opportunities, but only some people seize them.

D．Opportunities come to people when they are not ready.
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单项选择题

下列何项不是杏苏散的功用（）

A.解表

B.理肺

C.清热

D.化痰

E.轻宣凉燥
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