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26.带底座的直角尺,其名义尺寸是指底座的长度。 27.合象水平仪的分度值0.01毫米/米,是指在1米长度上,高度变化0.01毫米,因而反映的角度值相当于2角秒。 28.自准直仪是测量小角度的仪器。 29.圆度误差是由包容被测轮廓的两个同心圆来评定,当这两个同心圆的半径差为最小时,这个半径差就是圆度误差。 30.假设圆柱各截面的圆度误差都为零,说明这圆柱的圆柱度误差为零。
26. With a rectangular base of feet, the nominal size refers to the length of the base. 27. The scale of the co-ordination level is 0.01 mm / m, which means that the height changes by 0.01 mm over a length of 1 m, thus reflecting an angle equivalent to 2 arcsec. Autocollimator is a small angle measurement instrument. 29. Circularity error is assessed by two concentric circles that contain the measured contour. When the radius difference between the two concentric circles is the minimum, the radius difference is the roundness error. 30. Assuming that the circularity error of each section of the cylinder is zero, indicating that the cylindricity error of this cylinder is zero.