单选题
发布日期:2021-03-22
maintain alignment when the ship’s hull is working in heavy seas
ensure engine vibrations correspond to the natural frequency of the hull
permit the engine to expand away from the driven equipment as the engine heats up and expands
maintain engine thrust bearing clearances
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1999年12月9日,重庆大足石刻正式被联合国教科文组织列入《世界文化遗产名录》。
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