2015 Coal First Aid Statements No. 2
Taken from the 2015 National Coal First Aid Contest Rules
Progress Indicator:
 
Question 2 of 20
2. Methane monitors shall be maintained in permissible and proper operating conditions and shall be calibrated with a known airmethane mixture at least __________.
Choices:
- once each operating shift
- once each week
- once every 31 days
- once each month
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