Phân tích tư tưởng của nhân dân qua đoạn thơ: Những người vợ nhớ chồng… Những cuộc đời đã hóa sông núi ta trong Đất nước của Nguyễn Khoa Điềm
3417
1
0
9 trang
All ground water sources should be
located a safe distance from sources of
contamination. In cases where sources are
severely limited; however, a ground water
aquifer that might become contaminated
may be considered for a water supply, if
treatment is provided. After a decision has
been made to locate a water source in an
area, it is necessary to determine the
distance the source should be placed from
the origin of contamination and the direction
of water movement. A determination of a
safe distance is based on specific local
factors described in the section on "Sanitary
Survey."
Because many factors affect the
determination of "safe" distances between
ground water supplies and sources of
pollution, it...
Nội dung trích xuất từ tài liệu:
Pocket Guide on Industrial Automation For Engineers and Technicians
