A:银电极是负极
B:铜电极上发生的反应为Cu-2e-=Cu2+
C:外电路中的电子是从银电极流向铜电极。
D:该装置能将电能转化为化学能
若多项式x2+ax+8和多项式x2﹣3x+b相乘的积中不含x2、x3项,求(a﹣b)3﹣(a3﹣b3)的值.
He is organized and is often . I hope he will have more at his business.
观察微小物体时我们常借助显微镜.当我们观察远处的物体时还可以用____来辅助观察.