均质圆盘重Fp,半径为r,置于光滑墙和水平梁AE的末端E点上,梁AE自重不计,已知:q,AB=6m,BE=2m,α=45°,摩擦不计,则圆盘D点处的约束力为(
A <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23412102_0_1.png"> B
<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23412102_0_2.png"> C
<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23412102_0_3.png"> D
<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251103/23412102_0_4.png">