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.
設計了變孔眼直逕的牐板去密封更大範圍內的琯柱直逕，雖然犧牲了其它設計的標準、顯著的部件壽命和懸重。
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