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现测得水平仪读数为：－0.5，+1.5， +1，0.5，-1，-1.5，-1.5(格），求：（1)绘制导轨误差曲线图。（2)计算导轨在全长内的直线度误差值。答案：（1）作曲线图（图4）。（2）由曲线图可知全长内的最大直线误差N＝3.5格由Δ＝N×i×L＝3.5×（0......