Q553
When O2 falls to 10% or low and CH4 rises to 16% or more in fire stopping the samples collected at intervals of . . . . . . . .
A.
4 hours
B.
8 hours
C.
16 hours
D.
24 hours
AnswerAnswer: Option D
Solution
Answer: Option D
No explanation is given for this question Let's Discuss on Board