当矩形截面的角筋与中部直径不同时，例：4<img border="0" alt="" src="http://img.weimei168.com/uploads/upimg/20231004/13470555_0.png">22+10<img border="0" alt="" src="http://img.weimei168.com/uploads/upimg/20231004/13470555_0_1.png">22+8<img border="0" alt="" src="http://img.weimei168.com/uploads/upimg/20231004/13470555_0_2.png">20注写表示b边一侧钢筋为（）。