A:2H+ +2e- = H2↑
B:Fe - 2e- = Fe2+
C:2H2O + O2 + 4e- = 4OH-
D:Fe-3 e- = Fe3+
古代埃及是人类早期文明的发源地之一,其重要的文明遗存是( )
—Could I use your computer, Dad?
—Sorry, you _______. I'm going to work on it.