They stacked rocks with center holes (tube or doughnut shaped) from the surface to the deep stone layer as a guide for their drills (similar to today's guide tubes).
管状或中空管状的中心孔从地表到深石岩石层放满石头，以作为铁转的探头，作用类似今天的导管。
Guide magnet yoke of stator is hollow circular cylinder shaped, and is made up of magnetic conduction metallic material;
定子导磁铁轭为中空圆柱形，由导 磁金属材料制成；
The results show that the developed model can guide the design and application of the conically-shaped dielectric EAP actuators.
研究结果表明，本文的建立的模型可以为锥形介电型EAP驱动器的设计应用提供参考依据。
应用推荐