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Test # 50


1.
The Hydrochlorofluorocarbons (HCFCs) are the compounds which have the following molecules: 1. Hydrogen 2. Carbon 3. Chlorine 4. Fluorine Which among the above plays the most important role in Ozone depletion?

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Book : lost honour
Author : john dean.      .. More >>

objective case:
n.
1.the category of nouns serving as the direct object of a verb      .. More >>
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