单项选择题
A.乙酰胆碱 B.缓激肽 C.组胺 D.5-HT E.肾上腺素
A.0.1~1ppm B.5~10ppm C.20~40ppm D.40~80ppm E.100ppm以上
A.1~5ppm B.10~20ppm C.20~40ppm D.40~80ppm E.80~10ppm