单选题 1分

At sea,on what occasion would you display two red lights at night or two black balls during the day?

  • A.When vessel is on fire
  • B.When vessel is not under command
  • C.When vessel is restricted in her ability to maneuver
  • D.When vessel is carrying the dangerous cargoes

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4 单选题 1分
  • A.only if they are showing special purpose lights
  • B.in sight of one another in fog
  • C.only if they have operational radar
  • D.navigating in or near an area of restricted visibility
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  • A.good order and condition
  • B.apparent order and condition
  • C.rational order and condition
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