PA Mining Law II (referenced)
Practice test questions for the PA Mine Officials' Exam


Progress Indicator:
Question 2 of 20

2.  BG-4 minimum valve activates between __________ and __________ mbar.

Choices:
  1. 1 and 2
  2. .1 and 2
  3. .1 and 2.5
  4. 1 and 2.5


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