单项选择题
A.1:2.5水泥砂浆 B.1:1.5水泥砂浆 C.1:1水泥砂浆 D.1:3水泥砂浆
A.先勾竖缝后勾横缝 B.同时一起勾缝 C.先勾水平缝再勾竖缝 D.随便
A.l:2.5:3 B.1:0.5:4 C.1:0.5:1 D.1:2:3