square-bunch drop drill 方形穴播机
Finish the pneumatic design of all the functions of hill-drop drill, and produce the pneumatic circuit drawings.
对气动部分的各种功能进行了设计，并绘制出气动回路图。
Once you're on the ice, you drill your holes, line up the holes that are inside the Wilcraft, and press a couple switches to drop the hull onto the ice.
一旦你在冰面上，整齐的地钻一排冰洞都由Wilcraft内部完成，随后按一个双向开关把船体拖放到冰面上。
The laying position and well blowout pressure are analyzed and discussed briefly and the relationship curve of drill bit pressure drop vs flowrate and fluid density i.
对其安放位置及井喷压力进行了简要分析和探讨，建立了钻头压降与流量、流体密度的关系曲线。
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