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

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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

第一个

应该是第一个吧