A:2H2(g)+O2(g)═2H2O(l)△H1 2H2(g)+O2(g)═2H2O(g)△H2
B:S(g)+O2(g)═SO2(g)△H1 S(s)+O2(g)═SO2(g)△H2
C:C(s)+ 12 O2(g)═CO(g)△H1 C(s)+O2(g)═CO2(g)△H2
D:H2(g)+Cl2(g)═2HCl(g)△H1 12 H2(g)+ 12 Cl2(g)═HCl(g)△H2
①热量充裕 ②日照充足 ③降水丰沛 ④土壤肥沃
Thanks for ________ help.
5在“240÷40+20×2=8”算式中添上括号,使等式成立,正确的是( )