给水装置的管线、头、箱及排水管道的定期检查和维修。

Periodical inspection and maintenance of water supply system, supplying pipe, tape and tank, drain pipe.

youdao

给水装置的管线、头、箱及排水管道的定期检查和维修。

Periodical inspection and maintenance of water supply system, supplying pipe, tape and tank, drain pipe.

youdao