单选题图示钢筋混凝土挑梁，埋入砌体长度满足要求的是（　　）。<br/> ?A．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/18930811_0.jpg"><br/> ?B．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/18930811_0_1.jpg"><br/> ?C．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/18930811_0_2.jpg"><br/> ?D．<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251122/18930811_0_3.jpg">