設(shè),則x=0是f(x)的:()
A.可去間斷點 B.跳躍間斷點 C.振蕩間斷點 D.連續(xù)點
設(shè)函數(shù),要使f(x)在點x=1處連續(xù),則a的值應(yīng)是:()
A.-2 B.-1 C.0 D.1
極限的值等于:()
A.t B.-t C.1 D.-1