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3- Concernant les asphyxiants simples :A. Le méthane, l'éthane, le propane, le butane, sont des alcanes.B. L'hélium, l'argon, le chlore sont des asphyxiants simples.C. Les gaz asphyxiants simples provoquent des céphalées, impotence fonctionnelle, des troubles de la vigilance.D. Les propulseurs des aérosols ménagers actuels sont des asphyxiants simples.E. Toutes les propositions sont fausses.
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