All of the LB's series machines are made for soil mixing and drilling with Kelly bars continuous flight augers or double rotary heads.
所有 LB 系列机器均适用于土壤混合和钻杆钻杆连续螺旋钻或双旋转头钻孔。
Double heads
原声例句
奇趣工程百科
英语百科
Double heading
In railroad terminology, double heading indicates the use of two locomotives at the front of a train, each operated individually by its own crew. The practice of triple-heading involves the use of three locomotives.
Double heading is most common with steam locomotives, but is also practised with diesel locomotives. It is not strictly the same practice as two or more diesel or electric locomotives working 'in multiple' (or 'multiple-working'), where both (or all) locomotives are controlled by a single driver in the cab of the leading locomotive.
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