scale marking
... scale mark标度标记 scale marking标度标志 scale numbering标度数字 ...
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零[标度]标志 zero scale mark
零【标度】标志 zero scale mark
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临近方位标度盘有一个方向标志，需要对着方位标度盘外部边缘来读取所指示的选定航向。
Selected heading. A heading marker, located adjacent to and read against the outer edge of the azimuth dial, indicates the selected heading.
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