... triangular notch 三角凹口,三角形槽口... triangular compasses 三角规 triangular course 三角航线 ...
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The protractor (3) with a triangular rule is arranged on a board and is fixed on the two sides on the upper part of the compasses through an elastic fixing clip (7).
板面上带有三角尺的量角器(3)通过弹性固定卡(7)固定在圆规的上部两侧。
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