题目内容

对海关进口产品征收的增值税、消费税,不征收教育费附加。( )

A. 对
B. 错

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His manner was _______ he would offend everyone he met.

A. so that
B. such as
C. such that
D. so

An expository essay can _______.

A. give information about a topic
B. explain ideas
C. give directions
D. show how to do something

基坑开挖工程中降低地下水的作用?

氧浓度的计算公式是( )

A. 吸氧浓度(%)=21+4×氧流量(L/min)
B. 吸氧浓度(%)=21+4×氧流量(ml/min)
C. 吸氧浓度=21+4×氧流量(ml/min)
D. 吸氧浓度(%)=24+4×氧流量(L/min)
E. 吸氧浓度(%)=21+氧流量(L/min)

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