A.l/2 B.1/3 C.1/4 D.1/5
A.5mm B.5~l5mm C.20~30mm D.50mm
A.砂漿稠度過大 B.磚尺寸不標(biāo)準(zhǔn) C.軸線不準(zhǔn) D.未雙面掛線