单项选择题
A.1皮混凝土小型空心砌块 B.2皮混凝土大型空心砌块 C.1皮烧结普通砖 D.3皮烧结普通砖
A.500g/m2 B.300g/m3 C.400g/cm2 D.600g/m2
A.20~30mm B.50~100mm C.60~80mm D.40~50mm