單項(xiàng)選擇題WKL中間支座豎向變截面頂部有高差時(shí),當(dāng)上部縱向鋼筋在變截面處需彎折時(shí),其彎折長度為()

A.15d
B.△-bhc+15d
C.Laed
D.△-bhc+Lae


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