...in emerald and has direct contact with Colombian mines. 的...
a1、生活饮用水,工业给水的的处理,工业废水(含油污水,印染造纸厂污水等)处理,煤气洗涤水的处理。 1st, life tap water, industry for water processing, the industrial waste (oiliness sewage, printing paper mill sewage and so on) processes, coal gas washing water processing.[translate] ...