A.1/2~1/3 B.1/2~2/3 C.1/3~2/3 D.1/4~3/4
A.0.2~0.4MPa B.0.4~0.8MPa C.0.8~1.0MPa D.1.0~1.2MPa
A.500~600 B.400~300 C.200~300 D.100~200