The ideal rock sample is the conical surface rock sample that can joint crest of teeth in single row drilling experiment.
在单齿圈破岩试验中，理想的岩样是与牙齿齿顶线相贴合的锥面岩样。
2
According to the principle of constructing elliptical conical surface by the circles on a sphere, a T-joint inscribed in a sphere is designed.
根据“球面上圆构造椭圆锥面”的原理，设计了球内接三通接头。
3
The utility model relates to a novel joint which can make jewel necklaces connected, which is made by using the inverted conical pressure expanding and fastening principle.