upper seam的例句大全

The characteristics of cut-out arrangement in fully mechanized caving face in the relatively thinner thick coal seam, the mining mode and caving techniques in removing of supports from upper to lower seam and the maitenance measures in terminal face as well are introduced.

介绍较薄厚煤层综放开采工作面切眼布置的特点，支架由顶层向底层过渡的回采方式、放煤工艺及端面维护措施。

stoppers used for adjusting the size of the welding seam are arranged at the two sides of the rear upper press plier mounting plate.

所述后上压钳安装板的两侧安装有用于调整焊缝大小的限位螺栓。

mining experiment of upper coal seam under changxing karst aquifer in fengcheng mine area

丰城矿区长兴灰岩岩溶水体下上煤组开采试验

compositive precaution technology of gas in upper corner in fully mechanized mining work face in "two-hard" coal seam

“两硬”煤层综放工作面上隅角瓦斯综合防治技术

experimental study of gas relief from protected seam by gas drainage through crossing holes in upper airway of protective seam

保护层上风巷穿层钻孔抽采被保护层卸压瓦斯的试验研究

the upper collar and front facing are joined by the same seam.

领面与挂面由同一条缝相连.