本实用新型涉及一种可以钻左旋丝孔的骨科医用左旋钻头，它是在一个金 属钻杆上镂刻有左旋凹槽。
The utility model relates to a medical orthopaedics left-hand drill bit for drilling a left-hand thread hole. A metal drill rod is carved with a left-hand groove.
该文基于对MR阻尼器流变特性的力学分析，研制了一种活塞表面刻有螺旋凹槽的新型MR阻尼器。
Based on mechanical analysis on rheological characteristics of MR damper, a novel MR damper with helix slotted plunger is developed.
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