2) middle hard wall-rock
中硬围岩
3) medium hard rock
中硬岩石
4) medium hard rock formation
中硬岩层
1.
A new type of diamond-impregnated PDC bit was developed according to the characteristics of medium hard rock formation.
针对中硬岩层的特点设计了一种孕镶金刚石复合片钻头,介绍了其切削结构、特点及切削原理。
5) medium hard and hard rocks
中硬岩
1.
12 mining area in Chensilou Coal Mine,aimming at the low rates of half-hole marks problem of blast-winning roadway with bolting and shotcreting support in medium hard and hard rocks,corresponding countermeasures were put forward in the paper.
针对在陈四楼煤矿北十二采区北部西翼集中轨道下山施工时,中硬岩炮掘巷道成型中眼痕率较低的问题,提出了相应的对策。
6) shallow depth hard overlying strata
浅埋坚硬覆岩
补充资料：中覆
1.朝廷的批复。 2.向朝廷请示。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条