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Since being applicable,how many times has the montreal protocol been revised?

$\begin{array}{1 1}(a)\;4\\(b)\;5\\(c)\;6\\(d)\;7\end{array} $

1 Answer

7 times the montreal protocol has been revised
Hence (d) is the correct answer.
answered Mar 31, 2014 by sreemathi.v
 
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