This paper deals with the gasdynamic process of the spherical piston in a weak field of gravitation.
本文研究在弱引力场中活塞球对称运动的气体动力学过程。
The basic principle and the improvement of Santana spherical cast iron piston ring chromium plating technology is briefly introduced.
概要介绍桑塔纳球墨铸铁活塞环镀铬工艺的原理和改进过程。
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