They work with remote control devices that change the direction, position and speed of a German-made cutting machine that slices back and forth along a 300-metre-wide coal face.

他们操作的遥控装置可以改变截煤机的方向、位置和速度，这台德国产的截煤机可以沿着一道300米宽的煤面来回进行切割。

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Through its analysis of hydraulic performance, the cone-way valve can work well when hydraulic loss is very small, and we can get the change rule of the fluid pressure and the speed .

通过对其水力性能的分析， 表明该阀可在极小水力损失情况下正常工作，并得到了该阀阀板前后部流体压力及速度变化规律。

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And it is a work in progress, which must constantly debate its direction, its speed and its geometry, and which must soon change its rules to accommodate the applicants at its door.

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