“thin coal”可以造什么句,thin coal造句
来源:语文精选馆 2.76W
The top beam according to the utility model is propitious to the increase of operation space for worker, and is more suitable for the hydraulic supporting device for thin coal layer exploitation.
Regarding the extremely thin coal bed coal and the gas prominentpossibility analysis, in formerly practiced was a blank, therefore inthe production process knew and took the degree to be insufficient.