单选题
1分
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( )。
参考答案: B
参考解析: 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。