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林区公路圆曲线测设，传统的计算方法是计算器和查表相结合，计算速度慢，容易出错。为了简化计算过程，提高工作效率，争取错误率为零，应用ＫＣ—８５微机，代替传统的计算方法。为此，编制了本程序。本程序适用于林区公路圆曲线测设时的弦支距法，实测时，只需要输入中桩里程、测角度数、选用半径值三个数据，即可计算出所需数据。
Circular curve of forest road test set, the traditional calculation method is the combination of calculator and look-up table, the calculation speed is slow, error-prone. In order to simplify the calculation process, improve work efficiency, strive for error rate is zero, the application of KC-85 microcomputer, instead of the traditional calculation method. To this end, the preparation of this procedure. This procedure is applicable to the chord-bearing distance method when measuring the circular curve of the highway in the forest area. When measuring, only the data of the mid-pile mileage, the angle of measurement and the radius value should be input to calculate the required data.