不穿过, 不插入
Unthread the pump from the air valve and measure sag. 参考气压设定建议数值表打入相应气压以达到所需的预压行程。
To do so you need to loosen the top 3/8" nut and back it off without unthreading the threaded rod from the spider. 要这样做，就要松开顶部3/8英寸螺母并拿开，不要旋松星轮上的螺纹杆。
The Soviet model had a deep influence on China, but it's historic certainty to unthread the model. 苏联模式对中国产生过深刻影响，但走出苏联模式也是历史的必然。
In workover operation,running and pulling tubing and threading and unthreading in conventional way make the process complex,labor intensity high and operating environment hostile. 修井作业中,起下油管、上卸扣采用传统作业方式过程复杂,劳动强度高,作业环境恶劣,针对这种情况,提出了一种新的修井作业井口机械化系统设计方案。
Absorbable, causing little scars and no unthreading after operation 缝线可被肌体吸收、术后瘢痕小,不必拆线
Ensure material expedite on each chain, such as incoming, warehouse, workshop, shipping and unthread, improve the work efficiency; 负责物料及时接收，审核实际到料与采购定单是否符合，保证所收的物料必须是需求的物料。
