A.5% B.10% C.15% D.20%
A.2.0mm 1.4mm B.1.4mm 2.0mm C.1.8mm 1.2mm D.1.2mm 1.8mm
A.開(kāi)孔彈性材料 B.閉孔彈性材料 C.水泥砂漿 D.混合砂漿