图示结构由于支座移动Δ引起铰C左右两侧截面的相对转角为( )。
A <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23413169_0_1.png">(<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23413169_0_2.png">) B
<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23413169_0_3.png">(<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23413169_0_4.png">) C
<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23413169_0_5.png">(<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23413169_0_6.png">) D
<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23413169_0_7.png">(<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23413169_0_8.png">)