反复拉紧
发表于 2025-3-30 09:36:40
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Fester
发表于 2025-3-30 14:43:12
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漂亮
发表于 2025-3-30 19:17:50
Systems of Particles,In the study of the motion of several particles, it is sometimes more convenient to consider the motion of the system as a whole rather than the details of the motion of each separate particle. For this purpose it is useful to introduce the concept of the mass centre.
Basal-Ganglia
发表于 2025-3-30 21:58:13
Angular Vectors,The purpose of this chapter is to introduce a vector associated with rigid body displacements, and to discuss its properties and applications.