A.
B.
C.
D.
[单选题]A.1B.9C.2或5D.1或9E.3或6
[单选题]A.B.C.D.
[单选题]f(x)在x=0处( ).A.不连续B.连续但不可导C.D.
[单选题]A.B.C.D.E.
[单选题]A.0.3B.0.4C.0.8D.1.0