Valve shall have a brass body and stainless steel stem and spring.

这种阀门应该是黄铜阀体，不锈钢阀杆和弹簧。

youdao

Valve shall have a brass body and stainless steel stem and spring.

这种阀门应该是黄铜阀体，不锈钢阀杆和弹簧。

youdao