链(英语:cable、英语:cable length,意为缆绳长度),是海事惯用的长度单位,定义为十分之一浬[1]、等同于100㖊,然而其长度依据标准不同而有变化。此单位是由航海时代时船锚缆绳的长度所演变而来。其长度有数种定义[2]:
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