設(shè)f(x)=(1+e)/(2+e),則x=0是f(x)的:()
A.可去間斷點(diǎn) B.跳躍間斷點(diǎn) C.無(wú)窮間斷點(diǎn) D.振蕩間斷點(diǎn)
矩陣的特征值是:()
A. B. C. D.
在xOy面上,已知變換使點(diǎn)(x,y)與點(diǎn)(x′,y′)關(guān)于y軸對(duì)稱,則A是:()