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Submitted URL: http://www.hoc247.net//chuong/-2/-duong/-thang/-va/-mat/-phang/-trong/-khong/-gian/-quan/-he/-song/-song/-ct67.html
Effective URL: https://hoc247.net/chuong-2-duong-thang-va-mat-phang-trong-khong-gian-quan-he-song-song-ct67.html?/
Submission: On September 20 via api from US — Scanned from DE
Effective URL: https://hoc247.net/chuong-2-duong-thang-va-mat-phang-trong-khong-gian-quan-he-song-song-ct67.html?/
Submission: On September 20 via api from US — Scanned from DE
DOM tree The "DOM" is the Document Object Model