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Mining Engineering · Q399

Mine Ventilation

Engineering and GATE · Mining Engineering · question 399

Q399

Chemical detector tubes which are sealed at both ends can be stored for . . . . . . . . years.

A.
3 - 4
B.
5 - 6
C.
7 - 8
D.
1 - 2
Answer

Answer: Option D

Solution

Answer: Option D
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