图示结构,i为线刚度。AB杆的B端转动刚度(劲度)值为:() [img src="https://img.haodaxue.net/uploadimg/image/20200710/20200710091303_89844.png" alt="" />
A.1
B.3
C.4
D.7
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正确答案: B 答案分析:无
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