환경보호 매일 한 장, 7.29 참여 보상 3, 정답 시 추가로 5 지급
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단일 선택 문제: 여러 층의 지하수를 채취할 때, 각 수층의 수질 차이가 크다면, ( ) 방식으로 채취해야 합니다.A. 혼합 B. 층별 동시 C. 분층 D. 혼층.C
다층 지하수를 채취할 때, 각 수층의 수질 차이가 크다면 (C. 층별로) 채취해야 한다.
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