Instead of aiming for a niche in an attempt to find a 'gap in the market', or to fill a hole that probably doesn't need filling, they cater to a wide range purposes.
它们试着满足各种广泛的要求，而不是瞄准于试图弥补某些市场的空白或者填补那些可能不必要填补的地方。
The enlargement of hole diameter increased the exposed area and pressure releasing range of bored coal seam, and raised gas drainage amount and discharging effect from holes.
通过扩大钻孔的直径，从而达到增加钻孔的煤层暴露面积和卸压范围，增大钻孔抽排瓦斯量，提高钻孔的抽排效果。
It can increase the hole inclination Angle range and drill elevation Angle holes, while setting the top drive power head and hole top plate toward the opposite direction.
动力头及孔口板调转方向，可直接钻凿仰孔，大大增加钻孔倾角范围。
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