A.1986.7.1以后 B.1986.7.1以前 C.1987.4.6以后 D.1987.4.6以前
A.20℃,50 B.20℃,70 C.37.8℃,0.28 D.37.8℃,28
A.1ppm B.10ppm C.按1:10稀釋 D.15ppm