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When used with reversing reduction gears, medium-speed diesel engines should be bolted to their foundations with fitted bolts at the drive end and clearance(loosely fitted) bolts in other locations √This is done to （）
A:maintain alignment when the ship’s hull is working in heavy seas
B:ensure engine vibrations correspond to the natural frequency of the hull
C:permit the engine to expand away from the driven equipment as the engine heats up and expands
D:maintain engine thrust bearing clearances

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出自：海船船员证

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