One-stage or two-stage pumps feature up and down movement of flexible diaphragm during the mechanical stage which induces a flow of gas through the pump head, generating a vacuum.
单级或双级泵是通过橡胶膜片上下往复运动，引导气流通过泵头，形成真空状态。
The invention discloses a method for generating a shielding gas in the vacuum smelting of metals.
本发明公开了一种生成金属真空冶炼保护气体的方法。
A device for generating superfine image by atoms is composed of atom beam generator, vacuum chamber, coil, laser beam, computing holographic encoder chip and substrate.
本发明是一种用原子制作任意超微细图形的装置，由原子束发生器、真空室、通电线圈、激光束、计算全息编码片和基片等构成。
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