抽真空: creation of vacuumcreed receiving perforatordeaeratedegassingevacuationpick up the suctionvacuatevacuum pumpingvacuum supplyvacuum-extractionvacuum-pumpingvacuumize
The university of petroleum ( beijing ) thereby develops a simulation test device for hydraulic subsurface pump for gas and liquid two - phase flow 石油大学(北京)为此研制了一套气液两相流液压抽油泵模拟试验装置。