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    Suggest with reasons which one of the following to cylinder exhaust valves appear to be the most accurate
    (i) The removal of carbon deposits from valves seats and stem can be more detrimental than advantageous
    (ii) Carbon accumulation on injector nozzles is due to inadequate fuel preparation
    (iii) Tightness of starting air and relief valves is essential during engine operations

    please i need answers to this question

    thanks
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