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圖1中,∠1和∠2是直線DC、AB被DB所截而成的內錯角,∠3和∠4是直線AD、BC被BD所截而成的內錯角;圖2中,∠1和∠2是直線DC、AB被CB所截而成的同位角,∠3和∠4是直線AB、BC被AC所截而成的同旁內角.
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