明挖爆破施工,施工单位发出鸣10s,停,鸣10s,停,鸣10s的音响信号属于( 

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问题 明挖爆破施工,施工单位发出鸣10s,停,鸣10s,停,鸣10s的音响信号属于(  )。A.预告信号B.起爆信号C.准备信号D.解除信号

选项 A.预告信号
B.起爆信号
C.准备信号
D.解除信号

答案 B

解析 明挖爆破音响信号规定如下:(1)预告信号:鸣30s、停、鸣30s、停、鸣30s;(2)准备信号:鸣20s、鸣10s、停、鸣20s、鸣10s、停、鸣20s、鸣10s;(3)起爆信号:鸣10s、停、鸣10s、停、鸣10s;(4)解除信号:鸣60s。
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