Sub-endplate PMMA augmented screw showed the least subsidence among all the screws.
终板下PMMA强化椎弓根钉的下沉位移显著低于其他固定技术。
The purpose for the later is to improve the existing rotor screw drill for high efficiency. Subject heading: horizontal drilling screw drill tool control bending sub st...
研制后者的目的，在于改善现有中空转子螺杆钻具的软特性和低效率。
Use the tapping screw fix the board on the sub-keel and do the treatment of the sean connection.
将板用自攻钉固定在次龙骨上，并做好接缝处理。
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