Table Alidade, Instrument used on the board for drafting topographical charts in order to indicate the angles between two points.
台上用照准仪，在绘图台上使用的工具，用作之处两点间的角度。
Table Alidade, Instrument used on the board for drafting topographical charts in order to indicate the angles between two points.
台上用照准仪，在绘图台上使用的工具，用作之处两点间的角度。
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