试题与答案

下列物质中可以用直接法配制一定浓度溶液的是()A、HNO3 B、NaOH C、H2S

题型:单项选择题

题目:

下列物质中可以用直接法配制一定浓度溶液的是()

A、HNO3

B、NaOH

C、H2SO4

D、KHP

答案:

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阅读理解。

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B. A whole morning.  

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C. because he came to the car a bit late  

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