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(1) Preignition is caused by improper ignition timing.
(2) Detonation occurs when an area of the combustion chamber becomes incandescent and ignites the fuel/air mixture in advance of normal timed ignition.
Regarding the above statements,
| | A) only No. 1 is true. |
| | B) neither No. 1 nor No. 2 is true. |
| | C) both No. 1 and No. 2 are true. |
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