[石油]thread alternating;[石油]又称 :错扣(cross threading) ;
The distance between the main tong and the back tong is short, and this causes excessive clamping force on the tubing coupling.
国产液压钳主钳和背钳的间隔距离短,背钳夹持接箍时,因夹持力过大造成接箍变形引起粘扣。另外,油管对中性差也易造成错扣而粘扣。
The present scheme used in marking TEM4 dictation is the conventional count-and-deduct approach which is mistake-based and negative.
TEM4听写采用的是较传统的数错扣分法。
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