More often, all of the materials exposed to the etchant have a finite etch rate.通常, 所有暴露在刻蚀剂中的材料都具有一定的刻蚀速率.More often , all of the materials etchant have a finite etch rate.剂中的材料都具有一定的刻蚀速率.Hydrofluoric acid of Porcelain ...
In most of the residence halls we visited, rules prohibit disorderly conduct.在我们走访的学生宿舍里，大多明令禁止胡作非为。Prohibit the sale of alcoholic beverages.禁止出售含酒精的饮料.Legislation can quickly prohibit pesticide use.法律很快就会禁止使用杀菌剂....