In the coal face, tubing length of 1000 meters, up to more than 4000 joint socket, the tank without a special dust-proof facilities.

在采煤工作面，油管总长1000多米，接头插口多达4000多个，液箱无特殊的防尘设施。

youdao

In the coal face, tubing length of 1000 meters, up to more than 4000 joint socket, the tank without a special dust-proof facilities.

在采煤工作面，油管总长1000多米，接头插口多达4000多个，液箱无特殊的防尘设施。

youdao