The small variation of the steel-wire's length can be obtained by measuring the displacement of leveling bench with micrometer.
用螺旋测微器测量水准仪平移的距离，从而得到钢丝长度的微小变化值。
The small variation of the steel-wire's length can be obtained by measuring the displacement of leveling bench with micrometer.
用螺旋测微器测量水准仪平移的距离，从而得到钢丝长度的微小变化值。
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