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【单选题】
从承载能力和经济效益两方面考虑，在直径相同的情况下，图示结构中两杆的合理选材方案是（ ）。【图片】A.
1 杆为钢， 2 杆为铸铁
B.
1 杆为铸铁， 2 杆为钢
C.
两杆均为铸铁
D.
两杆均为钢
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