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환경보호 매일 한 장, 9.14 참여 보상 3, 정답 시 추가로 5 지급

2016-09-14View Original

Thread Content

다중 선택 문제; 수은, 카드뮴, 비소, ( ) 등이 포함된 용해성의 극독성 폐기물을 수역에 배출하거나 버리거나 지하에 직접 매설하는 것은 금지됩니다.A. 크로뮴 B. 납 C. 시안화물 D. 황리늄 . abcd
Reply #22016-09-14
ABCD~~~~~~~~
Reply #32016-09-14
A. 크로뮴 B. 납 C. 시안화물 D. 황리늄 .
Reply #42016-09-14
A. 크롬 B. 납 C. 시안화물

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