单项选择题
Plato is considered an essential figure in the developm...
判断题Plato is considered an essential figure in the development of philosophy, especially the Western tradition, and he founded the Academy in Athens, the first institution of higher learning in the Western world.
A.见图AB.见图BC.见图CD.见图D
设函数f（x）在（-∞，+∞）上有定义，则下列函数中必为偶函数的是（ ）A.y=｜f（x）｜B.y=-｜f（...
单项选择题设函数f（x）在（-∞，+∞）上有定义，则下列函数中必为偶函数的是（ ）
