特许区域 – English translation

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特许区域对于瓦斯煤矿，在特定的条件下其全部或部分区域,没有必要对可燃性气体以及煤尘爆炸采取安全措施时，可在指定的区域按照一般的爆破规则进行开挖作业。这一经批准的局部区域称为特许区域

specially permitted operation zone

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