A.75% B.85% C.95% D.65%
A.3%~5% B.4%～6% C.3%～6% D.2%～5%
A.7 B.8 C.6 D.5
A.烧结普通砖 B.烧结空心砖 C.烧结多孔砖 D.蒸压灰砂砖
A.12 B.13 C.14 D.15
