单项选择题
A.增大B.减小C.不变D.不确定
A.43.696m B.38.554m C.41.446m D.36.304m
A.0~360° B.-90~90° C.0~180° D.0~90°
如右下图所示,OC=60.500m,β(∠AOC0)-β1(∠AOC) =+30″,则CC0的值为()
A.+0.009m B.–0.009m C.–0.0045m D.+0.0045m
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