明挖爆破时，起爆信号是( )。A、鸣30s、停、鸣30s、停、鸣30s B、鸣20s、鸣10s、停、鸣20s、鸣10s、停、鸣20s、鸣10s C...

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问题明挖爆破时，起爆信号是( )。

选项 A、鸣30s、停、鸣30s、停、鸣30s B、鸣20s、鸣10s、停、鸣20s、鸣10s、停、鸣20s、鸣10s C、鸣10s、停、鸣10s、停、鸣10s D、鸣20s、停、鸣20s、停、鸣20s

答案 C

解析 2017教材P147页明挖爆破音响信号规定如下:起爆信号：准备信号lOmin后发出，连续三短声，即鸣10s、停、鸣10s、停、鸣 10s。

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文件: /twcms/kongphp/cache/cache_redis.class.php

位置: 第 85 行

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明挖爆破时，起爆信号是( )。A、鸣30s、停、鸣30s、停、鸣30s B、鸣20s、鸣10s、停、鸣20s、鸣10s、停、鸣20s、鸣10s C...

相关内容：明挖,爆破,起爆,信号

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