Engine_2014 : Motor Plants and Auxiliary Boilers - 979/2614
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| The diameter of a piston is usually less at the crown than at the skirt, in order to __________ . |
| A) facilitate the installation of piston rings |
| B) allow for the expansion of the piston during operation |
| C) prevent crankcase vapors from entering the combustion chamber |
| D) reduce wearing of the upper cylinder liner |
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