我国煤炭洗选加工相对落后，煤炭加工设备的利用率低。

Process of coal washing falls behind in our country. The utilization ratio of the processing equipments is low.

youdao

我国煤炭洗选加工相对落后，煤炭加工设备的利用率低。

Process of coal washing falls behind in our country. The utilization ratio of the processing equipments is low.

youdao