[ĐTN] VIDEO KHOẢNG CÁCH GIỮA HAI ĐƯỜNG CHÉO NHAU
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjt_CZ4lA_ygybYSVxseDX4XVBQMZlJ_5a0oKwHovPO3bOqH3DztER-dFnsZwrUZz6x-AscHcudZskSnrxZqIEPE5cDL3pGddbTrmOwR6TQlakC1y1DSlz0uhYY-tL-tPBJLWPPAdnG79k/s72-c/104pjg.PNG
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