The potassium chromate method is one regular method to determine COD.重铬酸钾法是测定化学需氧量的常规方法.It's a two - component, chromate free, epoxy polyamide adduct shop primer especially designed.是一种不含铬的双组份环氧聚酰胺加成物的车间底漆.Two - sta...
Fortunately, the chore of leaf sweeping is well worth the effort.幸运的是，干清扫落叶这个活儿是值得的。It was a methodical, unexciting chore.那是一份按部就班、枯燥乏味的无聊差事。He is prepared to make a living by accepting any remunerative chore.为了生计,他准备接受任...