主动红外探测器安装在室外要注意警戒范围内的干扰物。应安装在（_爱下问搜题

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问题单项选择题

主动红外探测器安装在室外要注意警戒范围内的干扰物。应安装在（）。

A、固定不动的物体上

B、连接到现场设备

C、任意位置上

D、周界的移动立杆上

答案

参考答案：A

补全对话，情景问答

补全对话。

( )1. Where did you go on vacation?
( )2. How do you feel about it?
( )3. What did you go there?
( )4. How was the weather there?
( )5. Did you buy anything?

A. It was fine and shining.
B. I swam in the sea and had some sea food.
C. I'd like to go there next summer.
D. I went to Hainan.
E. Yes, I bought some souvenirs.

填空题

二乙胺乙酸铜分光光度法测定水中二硫化碳时，采用曝气法将二硫化碳从水样中分离出来，如水样中存在硫化氢，可用（）溶液吸收，以除去干扰。