下矿井是有一定的危险的。
使用电梯下至地下矿井。
他们下矿井去了。
下矿井？
地下矿井中的防爆和保护。保护系统。第4部分：掘进机用自动灭火系统。
Explosion prevention and protection in underground mines - Protective systems - Part 4: automatic extinguishing systems for road headers.
与此同时，在两小时前放下矿井的一个麦克风使困在矿井里的人能够与亲人通话。
Meanwhile, a microphone, which WAS lowered into the mine two hours ago, has enabled the men to keep in touch with the closest relatives.
实验在美国南达·科塔州的荷马·斯塔克(Homestake)地下矿井内进行。
It is being housed underground at the Homestake mine in South Dakota, us.
露天矿场里面的矿物可以用重型机械成吨地开采，但是地下矿井里面得用镐费力地挖出来。
Minerals in open-pit mines are excavated by the ton with heavy equipment, but underground they are often extracted painstakingly with pickaxes.
论述了井下矿山矿井计量漏斗的结构、工作原理和设计方法等。
This paper describes and discusses the configuration, coorking principle and design methods, etc, of measuring hoper used in underground mine.
它能否正常运行，对矿井的煤炭生产及井下矿工的生命安全起着重要的作用。
If it can work well, it is important to the producing of coal and the safety of workers.
矿坑涌水直接危及地下矿山矿井安全，保障矿山安全渡汛是地下矿山的重大课题。
The gush-out water in the mineral pit endangers the underground mine safety directly.
目的：探讨煤矿井下矿工骨代谢变化。
Objective: To study the changes of bone metabolism in the underground coal miners.
目的：探讨煤矿井下矿工骨代谢变化。
Objective: To study the changes of bone metabolism in the underground coal miners.
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