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Sewage classes, a fragment from Wikipedia in Chinese, with translation into English
сен 17, 2017 | 07:09
Sewage classes [http://scipeople.ru/group/7124/discussions/]
污水类
Class IV: general industrial water area.
IV类:一般工业用水区。
V: agricultural water area, the general landscape requirements of water.
V类:农业用水区、一般景观要求水域。
Poor V class: useless dirty water, also known as super V class.
劣V类:无用脏水,也称超V类。