已知∠AOB,求作射线OC,使OC平分∠AOB. ①画射线OC,射线OC即为所求

已知∠AOB,求作射线OC,使OC平分∠AOB. ①画射线OC,射线OC即为所求;②以点O为圆心,适当长为半径画弧,交OA于点M,交OB于点N;③分别以点MN为圆心,大于MN的长为半径画弧,两弧在∠AOB的内部相交于点C,则上面作法的合理顺序为(  )

    A. ②③①                               B. ③①②          

    C. ③②①                               D. ②①③

答案

A

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