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Making junior high school mathematics learning tools
Make a small crane.

Find a toy gearbox, make a spool and fix it, then find a small stick, make a suspender and fix it, and then put a pulley block on the suspender head, so that objects with different weights can be hoisted by using the principle of pulley labor saving.

I have done it, and junior high school students who are fixed with foam can do it. It's simple.

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