Engine : Engineering Safety - 256/968
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| If a cargo tank has not been certified as gas free, __________. |
| A) breathing apparatus would not be necessary in an emergency as you would only be in the tank a short time |
| B) a man may work safely without breathing apparatus in cold weather, as vapors are less volatile |
| C) entry without a breathing apparatus may be made at the top of the tank since petroleum vapors are heavier than air |
| D) breathing apparatus should always be used |
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