Using periodic negative pressure and less amount of acid with multiple injection effectively reduces groundwater pollution.
同时它利用周期性负压和少量多次注酸，限制水井酸处理的污染范围，降低对地下水的污染程度。
2
A tubule stained to show the pink basement membrane underlying the base of the simple cuboidal epithelium. stained with periodicacid schiff reagent (pas), which stains mucopolysaccharides.
特殊显示多糖和糖蛋白的染色方法染色显示单层立方上皮下方的粉红色基膜。
3
They were positive for Congo red, Alcian blue, and periodicacid Schiff (PAS) stains.