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After putting on a self-contained breathing apparatus, you open the air supply and hear acontinuous ringing of a bell. What does this mean?______.

  • A.The unit is working properly
  • B.The face mask is not sealed properly
  • C.The air bottle needs to be refilled
  • D.The air supply hose has a leak
试题出自试卷《航海英语(甲类三副)试题及答案(1)》
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    • A.The unit is working properly
    • B.The face mask is not sealed properly
    • C.The air bottle needs to be refilled
    • D.The air supply hose has a leak
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