题目内容

在清洗中，管道内冲洗水的流速不应小于()m/s。

A. 1
B. 1.5
C. 2
D. 2.5

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二氧化碳对人体有窒息作用，当含量达到()以上时能使人窒息死亡，因此二氧化碳灭火系统的使用受到局限。

A. 0.15
B. 0.2
C. 0.25
D. 0.3

按电梯安装平面布置图要求，每根导轨上至少应设置2个导轨架，各导轨架之间的间隔距离应不大于()m。

A. 1
B. 1.5
C. 2
D. 2.5

听力原文：W: Mike, may I use the telephone here？
M: Sure. And local calls are free here.
Q: What does the man say about local calls？
(7)

A. They are free.
B. They are charged.
C. They are expensive.
D. They are cheap.

Section A
Directions: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A , B, C, and D.
I am looking forward to ______ from you as soon as possible.

A. hear
B. be hearing
C. hearing
D. have heard