Engine : Engineering Safety - 768/968
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| The atmosphere of an empty fuel tank is tested and designated "gas free". Which of the following statements is correct concerning this tank? |
| A) The gas free status is good as long as the initial conditions remain unchanged. |
| B) The concentration of flammable gas in the compartment is less than 10% of the lower flammable limit. |
| C) The tank should be frequently retested. |
| D) All of the above. |
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