The relative oxidizing or reducing strengths of redox couples are expressed interms of their ______ , which have the units of volts.

The characteristics of oxidizing agents? A: causes another substance to be oxidized B: contains an element whose oxidation state decreases in a redox reaction C: gains electrons D: is reduced

下列能进行污水同步脱氮除磷的工艺是（ ） A: A2/O B: Pho工艺redox C: VIP工艺 D: Phostrip