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Tonight's math homework: think about what materials are needed to measure the length of the red flag pole on campus and how to measure it.
Flat mirror, ruler. Put a flat mirror on the ground between the man and the flagpole. The man moves back and forth until he can see the top of the flagpole in the flat mirror.

Hongqi is a high-end automobile brand directly operated by China FAW. 20 1818. On October 8th, 65438+ China FAW released a brand-new Red Flag brand strategy with the brand concept of "China new noble Exquisite".

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