建筑阀门。供水减压阀和复合供水减压阀。要求和试验。

Building valves - water pressure reducing valves and combination water pressure reducing valves - Requirements and tests.

youdao

建筑阀门。供水减压阀和复合供水减压阀。要求和试验。

Building valves - water pressure reducing valves and combination water pressure reducing valves - Requirements and tests.

youdao