A.16:9
B.13:11
C.7:4
D.4:3
[单选题]A.16:9B.13:11C.7:4D.4:3
[单选题]A.16:9B.13:11C.7:4D.4:3
[单选题]A.16:9B.13:11C.7:4D.4:3
[单选题]A.16:9B.13:11C.7:4D.4:3
[单选题]A.16:9B.13:11C.7:4D.4:3
[单选题]A.2对B.3对C.5对D.6对E.A、B、C、D都不正确
[单选题]A.2对B.3对C.5对D.6对E.A、B、C、D都不正确
[单选题]A.31°B.28°C.24°D.22°E.20°
[单选题]A.(1)(2)B.(1)(4)C.(2)(3)D.(2)(4)
[单选题]A.(1)(2)B.(1)(4)C.(2)(3)D.(2)(4)