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问题 单项选择题

DB11/420-2007《电梯安装、改造、重大维修和维护保养自检规则》适用于乘客电梯、载货电梯、液压电梯、杂物电梯、自动扶梯和自动人行道的（）的自检。

A.安装

B.改造、重大维修

C.维护保养

D.A+B+C

答案

参考答案：D

填空题

根据句意和首字母提示完成句中所缺单词。

1. We are good friends. I think the f_____ between us will be on forever(永远)

2. He is very t_____, please give him a glass of water quickly.

3. There are many d_____ between English and Chinese, but we can learn them well.

4. Don't f_____ to finish your homework on time. Remember that!

5. Forty and fifty is n_____.
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单项选择题

测量工作中常用（）来表示直线的方向。

A．水平角

B．方位角

C．竖直角

D．磁方位角
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