... -双体/三体式传动轴 (Two-piece and three-piece propeller shafts) 气弹簧 (Gas springs) -高品质气弹簧 (空心棒型) (High-reaction gas springs; Hollow-rod type) ...
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hollow-rod type
空心杆类型
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Abstract : To address the issue of "gas lock" caused by CO2 gas-channeling in gas injection wells, the forced pull rod type hollow gas prevention pump for CO2 flooding has been developed.
摘要 ： 针对注气井CO2气窜而造成生产井气油比上升，常规管式泵游动阀打不开而导致的“气锁”问题，研制了CO2驱中空强制拉杆式防气泵。
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