单选题
发布日期:2021-03-22
prevent excessive cylinder liner wear
reduce friction losses in the engine
seal the space between the piston and the liner
limit upward flow of lube oil into the combustion space
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意大利著名摄影艺术家()指出:“拍一部电影要按照最适合这部特定的影片,和它所包含的思想方式去用光。”
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