A.0.02% B.0.2% C.2.0% D.20%
A.周 B.月 C.季 D.年
A.0.98MPa≤P<1.2MPa B.1.2MPa≤P≤1.5MPa C.1.568MPa≤P<9.8MPa D.1.568MPa≤P≤9.8MPa