scale arc
... 标定仪表||gage instrument 标度弧||scale arc 标杆||pylon ...
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程度标的目的弧度 radian in horizontal direction
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绝缘电阻表以前是按标度尺弧长定义的弧长误差，现行国家标准规定以指示值的百分数表示。
Formerly the arc length error for the insulation resistance instrument is defined by scale arc length. At present national standard determines that the percentage of indicated value expresses it.
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