高低压氮气连通线之间必须要求安装（）防止压力倒窜。A、缓冲罐_爱下问搜题

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问题单项选择题

高低压氮气连通线之间必须要求安装（）防止压力倒窜。

A、缓冲罐

B、控制阀

C、单向阀

D、流量计

答案

参考答案：C

选择题

When I called at his home the other day, I found him sitting on an armchair, _____ in his hands. [ ]

A. buried his head

B. burying his head

C. his head burying

D. his head to be buried

多项选择题

IGWB.INI配置文件中必配的参数有（）

A.AP Count

B.Server No

C.Cluster Mode

D.Local Port To Msg