如图,AB∥CD,则图中∠1、∠2、∠3关系一定成立的是(     ) A.

如图,ABCD,则图中∠1∠2∠3关系一定成立的是(    

A∠1∠2∠3180°         B∠1∠2∠3360°

C∠1∠32∠2               D∠1∠3∠2

答案

B

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