双弦法(测)
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two-chord method
two-chord方法
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The two sets of formulas for chord and are methods are derived by using vector algebraic method and some examples are listed for calculating and contrasting.
用矢量代数方法导出了弦步法与弧步法两组公式并作了例算对比。
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