China Naming Network - Naming consultation - What are the lottery tools for the school sports meeting?

What are the lottery tools for the school sports meeting?

Referees should measure athletes' high jump performance, which is generally around 1 ~ 3m, so it is more appropriate to reach the minimum scale value of 1cm, and a self-made rigid rod length ruler with a range greater than 1m and less than 3 m can be used. The tape measure in option AB does not meet the requirements because it is flexible and not easy to be vertical. The scale range in option c does not meet the requirements.

So choose D.

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