评茶用水,要求总氯小于()。A、0.1ppmB、0.2ppmC、0.5ppmD、1ppm
评茶用水,要求总氯小于()。
- A、0.1ppm
- B、0.2ppm
- C、0.5ppm
- D、1ppm
相关考题:
引起氟牙症的水源中含氟浓度是 ( )A.超过0.2ppm,小于0.5ppmB.超过0.1ppm,小于0.5ppmC.低于1ppm,超过0.5ppmD.超过2ppmE.超过1ppm,小于2.0ppm
引起氟牙症的水源中含氟浓度是()A、超过2ppmB、低于1ppm,超过0.5ppmC、超过1ppm,小于2.0ppmD、超过0.2ppm,小于0.5ppmE、超过0.1ppm,小于0.5ppm
单选题引起氟牙症的水源中含氟浓度是()A超过2ppmB低于1ppm,超过0.5ppmC超过1ppm,小于2.0ppmD超过0.2ppm,小于0.5ppmE超过0.1ppm,小于0.5ppm