单项选择题
A.聚氨酯 B.EPS砌块 C.水淬矿渣 D.泡沫玻璃材料
A.20 B.30 C.40 D.50
A.1/5~1/10 B.1/10~1/20 C.1/20~1/50 D.1/50~1/100