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【单选题】
桁架如图示,载荷F可在横梁(刚性杆)DE上自由移动。杆1和杆2的横截面面积均为A,应力均为 (拉和压相同)。求载荷F的值。以下四种答案中哪一种是正确的?( )A.
;
B.
;
C.
;
D.
。
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