A.A20mm B.B30mm C.C40mm D.D50mm
A.1:2 B.1:3 C.1:4 D.1:5
A.軟化點(diǎn)高的瀝青 B.軟化點(diǎn)低的瀝青 C.針入度大的瀝青 D.延性大的瀝青