物料的输送主要靠皮带机，但流动固体散料的计量是很困难的。

The things are carried by the belt machine. But it is difficult that the flowing solid things are counted.

youdao

物料的输送主要靠皮带机，但流动固体散料的计量是很困难的。

The things are carried by the belt machine. But it is difficult that the flowing solid things are counted.

youdao