井下的例句大全

A down-hole autotracking well pumping unit different from the conventional pumping unit was designed.

针对抽油技术的现状和存在的问题,设计了一种不同于有杆抽油方法的井下自动跟踪式抽油装置.

When mining coal in mine, danger of inflammable explosive damp exists all along, once damp explosion accident occur, normally, it can cause disastrous consequence.

在井下煤炭开采过程中，易燃易爆气体瓦斯危害始终存在，而瓦斯爆炸事故一旦发生，一般会造成灾难性的后果。

The wet multi-disc brake is a new brake widely used in construction and underground mining machineries.

湿式多盘制动器是一种广泛用于工程机械及井下矿山设备的新型制动器.

It can be used to mine and also be for other metal mines and tunnel construction.

它既可用于煤矿井下,也可用于金属矿山以及其他隧道施工.

Study on the current fault protective system in underground LV cable networks

煤矿井下低压电网电流故障保护系统的研究