A method is proposed to determine the bit footage when the drilling cost per meter reaches a minimum.
本文提出了一种按最低成本原则确定单只钻头进尺的实用方法。
2
Minimum order: 1000 meter.
最小订货量：1000米。
3
In front of each charger the necessary place must be calculated for two batteries plus a distance of minimum 0, 2 meter between the batteries to have a good ventilation during charge.