4934外墙周边的排水明沟的宽度通常不小于:()A.150mmB.180mmC.200mmD.250mm1286

外墙周边的排水明沟的宽度通常不小于:() A.150mm B.180mm C.200mm D.250mm 请帮忙给出正确答案和分析,谢谢!

答案解析