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【单选题】
设计双筋,当求受拉及受压钢筋截面面积时,用钢量最小或接近最少的方法是:
A.
令相对受压区高度等于相对界限受压区高度
B.
令受压区钢筋截面面积等拉区钢筋截面面积
C.
令受压区高度大于两倍的as'
D.
令受压区高度等于两倍的as'
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