First you must drain the dirty water out and then clean the pipe.
你必须先让污水排出去，然后再清洗管道。
Periodical inspection and maintenance of water supply system, supplying pipe, tape and tank, drain pipe.
给水装置的管线、头、箱及排水管道的定期检查和维修。
A water-spraying device is composed of a drain pipe and a water-spraying plate.
由泄水管和梳形散水板组成淋水装置。
A water-spraying device is composed of a drain pipe and a water-spraying plate.
由泄水管和梳形散水板组成淋水装置。
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