28.設燃油之化學式為,則完全燃生之化學反應式為+(n+m/4)O2+3.76✕(n+m/4)N2→( A )CO2+( B )H2O+( C )N2,則式中之( A )應為下列何者?(A)n(B)m(C)n+m/4(D)m/2