... a ruler 一把尺子 ; 一把尺 ; 尺子 ; 一把直尺 graduation ruler 刻度尺 Tob Ruler 表格定位标尺 ...
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The two ruler rods form an Angle which is overlapped on a measured Angle. The read number of the Angle reticle reflected onto the graduation ruler is a measured Angle.
两尺杆形成一个角重叠于被测角上,反映在刻度尺上的角度刻线读数就是被测角度。
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