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问题 单项选择题

空气净化用竹炭中水分含量的测定检测中所用干燥剂为（）。

A.未潮解的块状氯化钙或硅胶

B.硅胶或浓H2S04

C.未潮解的块状氯化钙或浓H2S04

D.浓H2S04

答案

参考答案：A

单项选择题

（）是疥疮的特征。

A.浅褐色斑块

B.淡白色疱疹

C.淡红色丘疹

D.淡红色包块
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单项选择题

I walked slowly through the market, where people () all kinds of fruits and vegetables: I studied the prices carefully and bought what I needed.

A. sell

B. were selling

C. had sold

D. have sold
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