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Engine_2014 : Engineering Safety - 845/2355
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If personnel are required to enter a cargo tank that has not been certified as "gas free", __________ .
A) entry without a breathing apparatus may be made at the top of the tank, since petroleum vapors are heavier than air
B) a person may work safely without breathing apparatus in cold weather, since the vapors are less volatile
C) breathing apparatus would not be necessary, if expected to be in the tank for only a short period of time
D) self-contained breathing apparatus should always be used
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