顶板基岩很薄的1203工作面开采出现突水而未溃沙证实了这些结论。

These conclusions are confirmed by 1203 coalface in which water bursting occur but sand bursting not when mining.

youdao

顶板基岩很薄的1203工作面开采出现突水而未溃沙证实了这些结论。

These conclusions are confirmed by 1203 coalface in which water bursting occur but sand bursting not when mining.

youdao