【名词&注释】
必典考网发布"Increasing differential pressure of an oil filter indicates"考试试题下载及答案,更多船舶动力装置题库的考试试题下载及答案考试题库请访问必典考网海船船员考试题库频道。
[单选题]Increasing differential pressure of an oil filter indicates that ()
  A. it is dirty 
  B. it is leaky 
  C. it has been renewed 
  D. all the above 
 
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