hang-off rams
常见例句
- Variable-bore rams are designed to seal a wider range of pipe diameters, albeit at a sacrifice of other design criteria, notably element life and hang-off weight.
设计了变孔眼直径的闸板去密封更大范围内的管柱直径，虽然牺牲了其它设计的标准、显著的部件寿命和悬重。
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