comprehensive mechanization coal mining的意思|示意
美 / /
英 / /
综合机械化采煤
comprehensive mechanization coal mining的网络常见释义
综合机械化采煤 ...综合机械化采煤、倾斜长壁、一次采全高、高产高效 [gap=1228]key words:vertical shaft with two levels; comprehensive mechanization coal mining; inclination longwell; full-seam mining; high yield and efficiency.