这个系统包括两个送风机（其中一个备用）、空气管和氧化空气分布管。

The system consists of two air blowers (one of them as a common spare), air piping and grid distribution pipe.

youdao

配件：遥控器一个、电源线一条、用户手册一本、镜头纸一本、产品合格证一张、信号线一条、备用保险管一只。

Accessories: a remote control, a power cord, a user manual, a lens paper, a product certification, a signal line, a back-up insurance control.

youdao

请保留在MIV上游管的设备用于水道的排污。

Pls keep provision on MIV upstream pipe for penstock drain.

youdao