A.1.10~1.20 B.1.20~1.30 C.1.30~1.40 D.1.40~1.50
A.15% B.20% C.25% D.30%
A.級(jí)配礫石 B.天然砂礫 C.級(jí)配碎石 D.級(jí)配砂礫