地下煤矿的防爆和保护。保护系统。第2部分：钝态水槽屏障物。
Explosion prevention and protection in underground mines - Protective systems - Part 2: passive water trough barriers.
地下矿井中的防爆和保护。保护系统。第4部分：掘进机用自动灭火系统。
Explosion prevention and protection in underground mines - Protective systems - Part 4: automatic extinguishing systems for road headers.
本实用新型用于测量气体的质量流量，具有防爆和减少流量计内部爆炸损失的优点。
The utility model is used for measuring the mass flow of air and has the advantages that explosion is prevented, and the explosive loss in the flowmeter is reduced.
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