单项选择题

基础知识,章节练习,土木工程师（水利水电）现代技术基础,电气技术基础

A.具有计数功能
B.保持原有状态
C.置“0”
D.置“1”
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单项选择题
The “iron mike” s a（n）______．A.pilotB.speakerC.standby wheelD.automatic pilot
A.A.pilot
B.speaker
C.standby
B.automatic
单项选择题
The bypass valve on a self-contained breathing device should be opened if ______．A.You are entering a space containing poisonous vaporsB.You are entering a space containing explosive gasesC.The regulator of the breathing apparatus malfunctionsD.The face piece of the breathing device is too tight
A.A.You
B.You
C.The
D.The
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