1454. Which statement about entering into a tank which has been sealed for a long time is TRUE?

The tank should be tested only once to ensure the oxygen content is at least 14% before entry.
The tank must be tested at frequent intervals to ensure that hazardous gasses have not regenerated.
If the oxygen content tests at less than 12% you should wear an approved gas mask.
The tank need not be tested for oxygen content if it is ventilated for more than 24 hours.

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