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。
2
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。
3
Use the tapping screw fix the board on the sub-keel and do the treatment of the sean connection.