A.20%~30% B.30%~40% C.40%~50% D.50%~60% E.60%~70%
A.500~600ppm B.600~800ppm C.800~1000ppm D.1000~1200ppm E.1200~1400ppm
A.0.002 B.0.02 C.0.2 D.2 E.>2