轮机英语【大管甲类】题库

单选题 1分

A built-up exhaust valve is one in which( )

  • A. the stem and heads are made of different material
  • B. low-alloy steel is used throughout
  • C. a replaceable valve disk is welded to the head
  • D. the self-centering action comes from motion of the valve stem in the guide
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轮机英语【大管甲类】-题库

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相关试卷

第一章 船舶主推进装置
第二章 船舶辅助机械
第三章 船舶电气和自动化
第四章 船舶轮机管理业务
第五章 国际公约、规则
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