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並前往https://ohio4h.org/sites/ohio4h/files/imce/Designing%20Your%20Own%20Model%20Rocket.pdf

Designing Your Own Model Rocket - Ohio 4-H Youth ...

(Solid-Fuel Model Rockets), have rocketry experience comparable to what is required for other advanced-level 4-H projects, and be able to plan and complete the ...

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