采用粗径岩心管、水泥封闭等方法在新生界松散层中人为叉孔有时效果不太明显。
The effect is not apparently when using methods of large-diameter barrels, cementation and so forth during branching drilling in Cenozoic loose beds.
前言： 钢质曲轴螺孔攻丝加工中经常出现螺纹烂牙、中径扩大等问题，且刀具寿命较短。
During tapping in steel crankshafts, the most commonly encountered problems are "mess tooth" and oversize thread, additionally the tap life is very low.
下部人孔、烟口、冷风口入口、转折管、变径管等。
Lower manhole, smoke vent, cold-blast inlet, transition pipe, telescoping pipeline, etc.
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