Q439
The quantity of coal dust amounts to rise in air as thick cloud is . . . . . . . . of space.
A.
20 - 30 g/m3
B.
80 - 40 g/m3
AnswerC.
40 - 60 g/m3
D.
60 - 70 g/m3
Answer: Option B
Solution
Answer: Option B
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