依据现行《建筑设计防火规范》的规定，隧道内机械排烟系统的排烟

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问题单项选择题

依据现行《建筑设计防火规范》的规定，隧道内机械排烟系统的排烟风机必须能在（）环境条件下连续正常运行不小于（）

A.280℃，1h

B.280℃，0.5h

C.250℃，1h

D.70℃，0.5h

答案

参考答案：C

单项选择题

离心式压缩机，一般盘车启动，空车运行（）分钟以上，才可升压送气。

A、10

B、15

C、20

排序题

Read and order. 读一读，给下列句子重新排序。

( ) I want to fly kites with my father. But he is working.

( ) OK. Let's go.

( ) Hi, Li Ming. What do you want to do?

( ) Yes, I like to play it.

( ) Oh, poor Li Ming. Do you like to play ping-pong?

( ) Would you like to play it with me?