问大家个设备,找了几本词典都没? Vacuum pumps: reciprocating piston type decrease the pressure to 1 Torr; rotary piston down to 0.001 Torr, two-lobe rotary down to 0.0001 Torr; steam jet ejectors, one stage down to 100 Torr, three stage down to 1 Torr, five stage down to 0.05 Torr. 请问红色部分是什么意思哦?有没对应的[wiki]设备[/wiki]图?查看更多1个回答 . 3人已关注