When the piston is moved by vacuum, its velocity changes in steps, for the mass of piston pin and rod are connected in turn.
当活塞在真空作用下运动时，由于活塞销和连杆的质量是依次连接的，活塞速度呈阶梯式变化。
2
The experimentally measured temperature dependence of retrograde velocity of vacuum arcs can be explained by the ion jet model for retrograde motion of vacuum arcs.
实验测得的后退速度的温度关系可用真空电弧后退运动的正离子喷流模型加以解释。
3
The results show that smoke sedimentation velocity is increased with the increase of the vacuum, the experimental results is accorded with the theory analysis.