people zhejiang shuangyu environmental engineering co., ltd. is a solution provider dedicated to product surface treatment and pollution control equipment; services and products include: pickling line, waste gas treatment, waste water treatment, pickling phosphating line, bearing steel pickling phosphating line, plate strip pickling phosphating production line, manual pickling phosphating production line, low-carbon high-carbon steel pickling phosphating production line, stainless steel pickling phosphating production line, semi-automatic pickling phosphating production line, small pickling phosphating production line, pre-treatment pickling phosphating production line, pickling phosphating waste gas wastewater treatment equipment, waste gas treatment equipment, metal surface 1 standalone query software 30 people