用单位荷载法求图4所示组合结构A,B两结点相对竖向位移时,其虚设单位荷载应取( )
A.[img src="http://img.haodaxue.net/uploadimg/ico/2020/0519/1589859551607557.png" />
B.[img src="http://img.haodaxue.net/uploadimg/ico/2020/0519/1589859569406762.png" />
C.[img src="http://img.haodaxue.net/uploadimg/ico/2020/0519/1589859584473540.png" />
D.[img src="http://img.haodaxue.net/uploadimg/ico/2020/0519/1589859601325786.png" />
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正确答案: B 答案分析:无
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