C. Conventional wastewater purification systems have not been fully successful in killing bacteria at cold temperatures.

传统的废水净化系统在低温下并不能完全成功地杀灭细菌。

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C. Conventional wastewater purification systems have not been fully successful in killing bacteria at cold temperatures.

传统的废水净化系统在低温下并不能完全成功地杀灭细菌。

youdao