选择题:One of the features of auto-immune diseases is tha

题目内容:
One of the features of auto-immune diseases is that they ________ within individuals and sometimes within an individual.s family.
A、squeeze
B、pack
C、cluster
D、pad
参考答案:

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若limf(x)=o,limg(x)=σ,则必有()(A)lim[f(x)+g(x)]=∞ x→a

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

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