当通风、空气调节系统的风管穿越防火分隔处的变形缝时，应检查其_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

当通风、空气调节系统的风管穿越防火分隔处的变形缝时，应检查其两侧是否设置公称动作温度为（）的防火阀。

A.50℃

B.60℃

C.70℃

D.80℃

答案

参考答案：C

解析：当通风、空气调节系统的风管穿越防火分隔处的变形缝时，应检查其两侧是否设置公称动作温度为70℃的防火阀。

填空题

关于x³-ax²-2ax+a²-1=0只有一个实数根，则a的取值范围是______．

完形填空

补全对话从方框中所给的选项中选择正确的句子补全对话。（10分）

A. How often should 1 take the medicine?
B. Yes, I do.
C. I have a bad cold.
D. Good afternoon, young man.
E. About two days.

A: Good afternoon, Doctor Huang.
B:     小题1:      What’s wrong with you?
A:       小题2:
B: Do you have a cough?
A:       小题3:     I cough now and then.
B: How long have you been like this?
A:      小题4:       And I’m feeling terrible now.
B: Let me check you over. Oh, you have a fever, too.
A: Is it serious?
B: Nothing serious. Take this medicine and drink more water.
A:       小题5:
B: Three times a day. Have a good rest and you’ll be all right soon.
A; Thanks a lot.
B: Not at all.