A.15mm B.10mm C.20mm
A.1.0~3MPa B.1.5~3MPa C.1.5~4Mpa
A.30 B.40 C.50 D.60
A.養(yǎng)護(hù)巷道 B.清除煤塵 C.美觀
A.20% B.10% C.15%