A.1% B.1.5% C.5% D.2.5%
A.右同向捻 B.左同向捻 C.右交互捻 D.左交互捻
A.通風(fēng)和排水設(shè)備負(fù)荷 B.全礦75%負(fù)荷 C.全部負(fù)荷