A.30~39N B.39~49N C.49~69N D.69~89N
A.0.1~0.4mm B.0.2~0.5mm C.0.3~0.6mm D.0.4~0.7mm
A.0.01~0.02MPa B.0.02~0.03MPa C.0.03~0.04MPa D.0.04~0.05MPa