题目如图,当剪刀口∠AOB\angle AOB∠AOB增大30∘30^{\circ}30∘时,则∠COD( )\angle COD\left(\ \ \right)∠COD( )A.减少30∘30^{\circ}30∘B.增加30∘30^{\circ}30∘C.不变D.增加60∘60^{\circ}60∘知识点：对顶角、邻补角章节：未标注
如图,当剪刀口增大时,则如图,当剪刀口增大时,则如图,当剪刀口增大时,则