환경 보호 매일 한 문제 (12.20)
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단일 선택 문제: 폐수 처리장에서 배출되는 정화된 폐수의 BOD5 수치는 ____mg/L 미만입니다.A.60 B.150 C.100 D.90 선택: A
폐수 처리장에서 배출되는 정화된 폐수의 BOD5 수치는 _B___mg/L 미만입니다.A.60 B.150 C.100 D.90
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