Explosion-proof of hydraulic solenoid valves for well hydraulic system is a bottleneck problem to have to be solved.

煤矿井下液压系统中，液压电磁阀防爆是必须解决的关键问题。

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All gas valves, pipes, cylinders and explosion-proof lamps will be installed in the yard.

气瓶站里将安装气瓶减压阀，气体管路，气瓶以及。

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All gas valves, pipes, cylinders and explosion-proof lamps will be installed in the yard.

气瓶站里将安装气瓶减压阀，气体管路，气瓶以及。

youdao