Détecter la presence d'eau

Average rating : Published by axel001 on February 22nd, 2013
Physiques-Chimie

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Question 1
L'eau est omniprésente sur Terre. La plus grande part de cette eau est salée. Quel est le pourcentage d'eau douce directement utilisable par l'homme?

97%
3%
Moins d'1%

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Author : axel001
Difficulty : EasyPlayed :
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