Discussion :: Water Supply Engineering
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Pick up the correct statement from the following :
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A.
The precipitation during its travel in atmosphere dissolves certain gases
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B.
Rain water which percolates through the ground, is free from suspended materials
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C.
Under ground water may dissolve minerals and salts present in the earth's layers
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D.
Small quantities of iron, calcium and magnesium dissolved in water, may be useful for human health
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E.
All the above.
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