传统的试算法和图解法工作量大，易产生误差，且无法进行经济分析。
The traditional trial arithmetic and the graphics arithmetic have many disadvantages, especially the tremendous workload, the bad error tolerance and not having the economic analysis ability.
在使用水平仪对平行度误差进行测量及评定时，目前一直沿用着用手工按图解法或计算法进行数据处理。
In measuring and evaluating the parallelism error with the leveler, data processing is conventionally carried out by manually graphic and calculation methods according to the data measured.
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