单选题如图所示的结构，用位移法求解可得（　　）。<br/> <br/> <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/8325612_0.png"><br/> <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/8325612_0_1.png">