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dsProject/dsRag/Txt/processed_chunks/1080.txt

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4. 直线是它上面的点一样的平放着的线。7. 平面是它上面的线一样的平放着的面。
关于角、平角、直角和垂直是这样定义的:
8. 平面角是在一平面但不在一条直线上的两条相交线相互的倾斜度。
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