[问答题]问
[单选题]问A.30oB.45oC.60oD.70o
[单选题]问A.[0,1]B.(0,1)C.(-∞,0)D.(0,1]
[单选题]问A.AB.BC.CD.D
[单选题]问A.{xB.x≤3}C.{xD.3≤x≤5}
[单选题]问A.π/6B.π/3C.2π/3D.5π/6
[单选题]问A.2B.-4C.8D.-16
[单选题]问A.15oB.30oC.45oD.60o