A:Completing
B:To complete
C:Complete
D:Completed
C(s)+O2 (g)═CO2 (g)△H=﹣393.5kJ.mol﹣1;
则4Fe(s)+3O2(g)═2Fe2O3(s)的△H是( )
A. So today I've got a cold.
B. So today he's got a stomach ache.
C. So today I've got a stomach ache.
D. So her father took her to the hospital.
E. So today she's got a headache.
函数f(x)=|x+1|﹣|2﹣x|.
——据吕思勉《魏晋南北朝史》