7、It adopt dry filling method in the orebody above -350m level and adopt the method of sublevel caving in the orebody under the level. Exploitation engineering already reach -385m level.
1、One blow from caving in?
5、Another important reason to say no, Sills says, is it keeps us from caving in to peer pressure.
10、It beats us all the time - not just with eating, but with anything we try to do and end up quitting, caving in, doing it despite our best efforts.
6、By trial of fully mechanized caving in relatively thinner thick coal seam in Y. J. L. coal Mine, the problems in mining are raised and the ways to increase its unit production are discussed.
3、Even big firms are reportedly caving in, particularly for those writing large cheques.
2、Or will the walls start caving in?
4、Contemporary illustrations show cathedral spires collapsing, vaults caving in, high scaffolding keeling over in a chaos of planks and poles.
9、There's something called a trench box-a metal case that holds back the sides of the walls-used to stop the walls from 5 caving in when you dig deeper than 5ft.
8、There's something called a trench box - a metal case that holds back the sides of the walls - to be used to stop them caving in when you dig deeper than 5ft.
国文精选馆
