A kind of new mechanical transmission-the planetary ringy gear transmission is introdueed.

提出了一种适用于无游梁抽油机的新型传动机构-行星齿环传动。

The semi freedom short circuit is superposed by parallel plane flow, confluence and ringy turbulence jet.

半自由状态下的短路流场是平行平面流、环形紊流射流及汇流叠加而成。