一導線之縱距閉合差為 20cm，橫距閉合差為 18cm，導線全長為 1500m則該導線之閉合比數約為？(A)1/1974 (B)1/3947(C)1/557

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42. 一導線之縱距閉合差為 20cm，橫距閉合差為 18cm，導線全長為 1500m則該導線之閉合比數約為？
(A)1/1974
(B)1/3947
(C)1/5576
(D)1/7895

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