闭合导线ABCD,已知横坐标增量ΔyAB=120.36m,ΔyCB=60.10m,ΔyCD=20.52m,ΔyDA=-80.73,则fy为()

A.+79.21m B.-0.05m C.-79.21m D.+0.05m

时间:2023-11-13 11:23:07

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