Q110
Dust plan shall be maintained in every mine having working below ground plan on a scale having representative factors of not less than . . . . . . . . clearly, showing by distinctive colours, code letters and numbers.
A.
500 : 1
B.
1000 : 1
C.
1500 : 1
D.
2000 : 1
AnswerAnswer: Option D
Solution
Answer: Option D
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