Disolved oxygen (DO) in water should be?
Disolved oxygen (DO) in water should be?
A. 400 to 800 ppm
B. 4000 to 8000 ppm
C. 0.4 to 0.5 ppm
D. 4 to 5 ppm
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E. 100mMaterials for rain-proof coats and tents owe their water proof properties to________?
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