Schema del sistema dell'arco riflesso secondo Helmholtz
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The original uploader was <a href="https://en.wikiversity.org/wiki/it:User:Felimblack" class="extiw" title="wikiversity:it:User:Felimblack">Felimblack</a> at <a href="https://en.wikiversity.org/wiki/it:" class="extiw" title="wikiversity:it:">Italian Wikiversity</a>.
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