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212. Which symbol represents a 20-fathom curve?
Choice B is correct; the 20-fathom curve is represented on nautical charts by a dash-double-dot line pattern, matching option B. Fathom curves use this distinctive pattern to indicate depth contours, differentiating them from other chart markings. The 20-fathom curve specifically follows this standard line style, and other options depict incorrect patterns.
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