"Safety Regulations of Coal Mine" 445th reading that all switches must have two to guard against is an easily neglected clause.
前言：《煤矿安全规程》第445条，关于所有开关必须有“两防”功能的规定是一条易被忽视的条款。
"Safety Regulations of Coal Mine" 445th reading that all switches must have two to guard against is an easily neglected clause.
前言：《煤矿安全规程》第445条，关于所有开关必须有“两防”功能的规定是一条易被忽视的条款。
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