China National Standard yeCBS yekuchengetedza hupenyu ndeye 6months {}
Munguva yekushisa kwakanyanya uye kunyorova muzhizha kana panguva yekuchengetedza kwenguva refu
Liquid chromatography inofanira kuongororwa mazuva makumi mapfumbamwe ega kusvika kuyerera kwekunyepedzera.