如图,直线a、b被c所截,若∠1=∠3,则______∥______,根据是______;若∠2=∠4,则______∥______,根
如图,直线a、b被c所截,若∠1=∠3,则______∥______,根据是______;若∠2=∠4,则______∥______,根据是______;若∠2+∠3=1...
如图,直线a、b被c所截,若∠1=∠3,则______∥______,根据是______;若∠2=∠4,则______∥______,根据是______;若∠2+∠3=180°,则______∥______,依据是______.
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