A.900L B.1000L C.1150L D.1200L
A.(750±20)~(900±20)kPa B.(650±20)~(800±20)kPa C.(850±20)~(1000±20)kPa
A.400~500kPa B.500~600kPa C.450~550kPa D.600~700kPa