【单选题】通常根据医院用品的危害程度和与人体接触部位的不同分为三类。下列属于高度危险性物品的是:()
【判断题】金属是由很多小晶体组成的,小晶体称为晶粒。
【单选题】– Does Bill do his new job well? -- _____ his old job. I’m afraid there is no hope for him.
【判断题】金属是由很多小晶体组成的,小晶体称为晶胞。
【单选题】Does Bill do his new job well? ______his old job. I'm afraid there's no hope for him.