A.20 B.25 C.30 D.35
A.5MPa〈P〈80MPa B.10MPa〈P〈90MPa C.10MPa≤P〈100MPa D.15MPa〈P〈100MPa
A.15℃,1atm B.15℃,1.5atm C.20℃,1atm D.20℃,1.5atm