The acceptable coliform (大肠杆菌) counts for fecal (粪便) contamination (污染) according to U.S.standards at beaches (海(湖、河)滩)
问题描述：
The acceptable coliform (大肠杆菌) counts for fecal (粪便) contamination (污染) according to U.S.standards at beaches (海(湖、河)滩) is:()
■.one/100ml of water
■.one hundred/100ml of water
■.one thousand/100ml of water
■.none
答
第一个