high-grade coal的意思|示意
优质煤
high-grade coal的网络常见释义
优质煤 ... high-gain linear circuit 高增益线性电路 high-grade coal 优质煤 high-grade energy 高势能，高级能 ...
high-grade coal相关短语
1、 high grade coal 高品位煤 ; 高级煤
2、 high-grade coal separation equipment 高档选煤设备
3、 high-grade caving coal 高档放顶煤