若limf(x)=o,limg(x)=σ,则必有()
(A)lim[f(x)+g(x)]=∞
x→a
(B)lim[f(x)-g(x)]=0
(C)lim1/f(x)+g(x)=0
(D)limkf(x)=∞(k为非零常数)
x->a
出自:华北水利水电大学-高等数学