A.大于07% B.0.7%~1% C.2.5%~5% D.3.5%~5%
A.160~190kPa B.200~250kPa C.250~300kPa D.300~350kPa
A.φ0.8mm B.φ1.0mm C.φ1.2mm D.φ1.8mm