氧气减压阀的外观及工作原理。

The appearance of oxygen and pressure relief valve works.

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氧气减压阀的使用方法(1)按使用要求的不同，氧气减压阀有许多规格。

Oxygen valve to use (1) according to the different application requirements, oxygen valve has many specifications.

youdao

氧气减压阀的使用方法(1)按使用要求的不同，氧气减压阀有许多规格。

Oxygen valve to use (1) according to the different application requirements, oxygen valve has many specifications.

youdao