单项选择题

The “iron mike” s a（n）______．
A.pilot
B.speaker
C.standby wheel
D.automatic pilot

A.A.pilot
B.speaker
C.standby
B.automatic
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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
单项选择题
钢筋受压时的屈服强度与受拉时基本相同。
A．对
B．错
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