bottom hole-down的意思|示意

He added that in an emergency, such as the capsule getting jammed in the rescue hole, the bottom can be opened with levers inside so the miner can be lowered back down by cable.

他补充说，在紧急状况下，比如说救生舱卡在了救援孔里，底部可以用里面的杠杆撬起，那么矿工可以通过电缆降低回落。

A circular hole equals to the cylinder of the jointing component and gaps through which the nylon can fall down are reserved in the vicinity of the opposite Angle at the bottom of the flat triangle.

在平面三角底边对角的近处，预留下与连体构件的圆柱体相当的圆洞和尼龙丝可以落下的缝隙。

The separated layer polymer injection pipe string consists of well-flushing packer, down-hole flow distributor and bottom ball.

分层注聚管柱主要由可洗井封隔器、配注器及底球组成。