A.
B.
C.
D.
[单选题]A.(-∞,-2)∪(2,+∞)B.(-∞,-2)∪[2,+∞)C.(-2,2)D.(2,+∞)E.A、B、C、D均不正确
[单选题]A.B.C.D.
[单选题]A.26.65%B.27.42%C.27.96%D.28.85%
[单选题]A.20,30AB.20A,21.2AC.28.28A,30AD.28.28A,21.2A
[判断题]A.对B.错