Mass point mass的意思|示意

The center of mass of a system is defined as follows: I have here some kind of an object not just a point mass, but it has a finite size.

系统的重心,是这样定义的：,我有一个物体,不是有棱角的物体，但它大小有限。

Hydromechanical coupling of jointed rock mass was the key point for problems of hydraulics of rock mass.

裂隙岩体的渗流应力耦合机理是岩体水力学的研究重点。

To integrate quality tool with Mass Customization Production-processing, design a quality system that fit for Mass Customization Production-processing is the key point of the researching on.

将质量管理的工具与大规模定制制造过程进行整合，设计出符合大规模定制企业制造过程的质量信息系统是本文的研究重点。