【名词&注释】
临床表现(clinical manifestation)、水蒸气(steam)、海洋环境(marine environment)、密封性(sealing)、有害生物(pest)、胸膜炎(pleurisy)、喷射泵(jet pump)、隔离法(isolation method)、工作中、活塞环槽(piston ring groove)
[单选题]Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger? .
  A. Reduce engine speed to idle before removing the filter 
  B. Soak the dirty filter in kerosene only 
  C. Blow out the air inlet with compressed air 
  D. Cover the air inlet after removing the filter 
 
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