题目

      you know your potential, you have to rely on many other people to get to where you are.     A．Since    B．If   C．While    D．Once 答案：C 解析: 略下列热化学方程式中的反应热下划线处表示燃烧热的是 A．C6H12O6(s)+6O2(g)6CO2(g)+6H2O(l)；ΔH=-akJ·mol-1 B．CH3CH2OH(l)+O2(g)CH3CHO(l)+H2O(l)；ΔH=-bkJ·mol-1 C．CO(g)+ O2(g) CO2(g)；ΔH=-c kJ·mol-1 D．NH3(g)+O2(g)NO(g)+H2O(g)；ΔH=-d kJ·mol-1