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| Q. |
Which of the following symptoms will not show that the combustion is necessarily complete or not? |
| A. | Presence of free carbon in exhaust |
| B. | Presence of carbon monoxide in the exhaust |
| C. | Presence of oxygen is the exhaust |
| D. | Presence of nitrogen in the exhaust |
| E. | None of the above |
| Answer» D. Presence of nitrogen in the exhaust | |
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