A.对
B.错
[判断题]A.对B.错
[单选题]A.B.C.D.0
[单选题]A.1mmB.2mmC.1.5mmD.2.5mmE.0.5mm
[单选题]A.x>-2B.-2<x<2C.x<2D.空集E.x≠2
[单选题]A.225πB.C.215πD.E.205π