单项选择题
A.3mmB.6mmC.5mmD.2mm
A.R=αB.R=180°-αC.R=α-180°D.R=360°-α
A.90°B.80°C.120°D.60°
A.XB=1063.59m ,YB=2045.44mB.XB=1000.59m ,YB=2045.44mC.XB=1066.59m ,YB=2048.44mD.XB=1000.59m ,YB=2048.44m
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