Fourth step, to the host pumping a vacuum, plus the amount of refrigerant oil and refrigerant.
第四步，给主机抽真空，加适量冷冻油和冷媒。
This paper designs a step forward pneumatic climbing robot by means of vacuum pads which can move on flat surfaces, especially vertical plane walls with the features of simplicity and flexibility.
本文根据真空吸附原理，采用先进的气动元器件设计一个能在垂直墙面上，通过脚步行进方式，在四个方向垂直移动的气动爬墙机器人。
The paper introduces the principle of ZK400 Vacuum RT Machines; from control pulse frequency of step-motor to adjust mixes speed of Vacuum RT Machines.
本文介绍了ZK - 400真空注型机的原理及功能，并重点介绍了通过控制步进电机的脉冲频率达到调节真空注型机搅拌速度的目的。
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