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【单选题】
图示两桁架中各杆的材料和横截面均相同 , 设 和 分别为这两个桁架稳定的最大荷载 , 则有四种答案 :
A.
F 1 =F 2
B.
F 1 >F 2
C.
F 1 2
D.
不能确定
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A.
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B.
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