An oxygen indicator can be used to determi
问题:
An oxygen indicator can be used to determine if there is().
A.sufficient oxygen in a compartment to support life
B.combustible gases present
C.hydrogen gases present
D.All of the above
An oxygen indicator can be used to determine if there is().
A.sufficient oxygen in a compartment to support life
B.combustible gases present
C.hydrogen gases present
D.All of the above