單項(xiàng)選擇題彎起角度為30°時(shí),彎起鋼筋凈長(zhǎng)=()

A.L-2c+2×0.268H′
B.L-2c+2×0.414H′
C.L-2c+2×0.577H′
D.L-2c+2×0.115H′


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