所有的管路、阀门、压力表都由高质量的不锈钢构成，并且都是标准配件。

All valves, regulators and gauges proposed for the gas distribution lines shall be of good quality, stainless steel type, made for specific gasses and shall be provided with standard fittings.

youdao

所有的管路、阀门、压力表都由高质量的不锈钢构成，并且都是标准配件。

All valves, regulators and gauges proposed for the gas distribution lines shall be of good quality, stainless steel type, made for specific gasses and shall be provided with standard fittings.

youdao