止顶(knock pin), 此释义来源于网络辞典。
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顶点停止 Auto Top Stop
防止上顶的爪簧 hold-down finger
顶角止裂槽 Corner Relief
阻止的顶级域列表 Blocked Top-Level Domain List
浮顶终止高度 end height of floating roof
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顶塞具有一个实心的塞体，根据泵压的增加它能可靠地显示与止塞箍和底塞的接触。
The top plug has a solid body that provides positive indication of contact with the landing collar and bottom plug through an increase in pump pressure.
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