Fluoride content in drinking H2O normally safe is

Written By Unknown on Wednesday, 9 November 2011 | 01:51


Fluoride content in drinking H2O normally safe is 

a) 0.5-0.8 mg/dl 

b) 0.8-0.1 ng/dl 

c) 0.2-0.8ng/dl 

d) 0.2-0.5mg/dl 

[Ans (a)]
Posted by Unknown at 01:51
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