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    <title>Masque perfor</title>
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<h2 class="pHeading2">
Masque perfor
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Dans les moniteurs CRT, le masque perfor est une plaque mtallique pleine de petits trous qui est fixe  la paroi intrieure de l'cran de verre. Il concentre les faisceaux des canons  lectrons  l'arrire du CRT. La distance entre ces trous est appele "pas de masque".
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