In order to protect the aquatic creatures, the dissolved oxygen content in fresh water stream should never be less than __________ PPm.

In order to protect the aquatic creatures, the dissolved oxygen conten

1.	In order to protect the aquatic creatures, the dissolved oxygen content in fresh water stream should never be less than __________ PPm.
A.	0.5
B.	1
C.	5
D.	20
Answer» D. 20

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In order to protect the aquatic creatures, the dissolved oxygen content in fresh water stream should never be less than __________ PPm.

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