When attaching an oxygen regulator to a D cylinder and preparing it for use, you should recall that:
A: a pressure-compensated flowmeter should be used when lying the oxygen cylinder down.
B: oxygen supports combustion and should not be used where sparks are easily generated.
C: the cylinder must remain in a standing position at all times or it will not deliver any oxygen.
D: the cylinder should be taken out of service and refilled when it contains less than 750 psi.
Answer: B: oxygen supports combustion and should not be used where sparks are easily generated.
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