A.1-3% B.0.1-0.3% C.0.3-1% D.3-10%
A.花街鋪地 B.卵石路 C.石子畫(huà) D.冰裂紋鋪地
A.1~4% B.0.1~0.4% C.10~40% D.0.3~8%