查询词典 helicoid

Helicoid hydraulic motor makes up of bypass valve, motor, universal joint and transmission shaft, whose driving force is wellbore circulating fluid. It can be applied to bridge plug or cement plug treatment combined with grind shoe and other tools by mechanical energy for bottomhole rotation transferred from the energy of high pressure fluid.

螺杆钻具是以井筒循环液体为动力的井下钻具，由旁通阀、马达、万向节和传动轴4部分组成，其工艺特点是将高压液体的能量转变为井下旋转的机械能，带动井下磨鞋或其他工具，来处理井筒桥塞或水泥塞。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。