A. 5.0-6.0,6.5-8.5 ppm, 6.0 ppm, 500 ppm, 10.0 ppm
B. 6.5-8.5,5.0-6.0 ppm, 6.0 ppm, 10.0 ppm, 500 ppm
C. 6.5-8.5.5.0-6.0 ppm, 10.0 ppm, 6.0 ppm, 500 ppm
D. 5.0-6.0,6.5-8.5 ppm, 6.0 ppm, 10.0 ppm, 500 ppm
সঠিক উত্তরঃ
B.
6.5-8.5,5.0-6.0 ppm, 6.0 ppm, 10.0 ppm, 500 ppm