The structure, principle and application of plunger-type valves at gas station are introduced.

介绍了柱塞阀的结构、工作原理及其在煤气站的应用。

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The structure, principle and application of plunger-type valves at gas station are introduced.

介绍了柱塞阀的结构、工作原理及其在煤气站的应用。

youdao