单选

Deficient oxygen content inside a chain locker can be detected with ______.

  • A.litmus paper
  • B.a combustible gas indicator
  • C.an oxygen breathing apparatus
  • D.an oxygen indicator
参考答案
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Diesel engines are considered safer than gasoline engines because ______.

  • A.they are more heavily built
  • B.the fuel used is less volatile
  • C.they can be easily reversed
  • D.they operate at a lower speed

Deviation is caused by ______.

  • A.changes in the earth’s magnetic field
  • B.nearby magnetic land masses or mineral deposits
  • C.magnetic influence inherent to that particular vessel
  • D.the magnetic lines of force not coinciding with the lines of longitude

Deviation is the angle between the ______.

  • A.true meridian and the axis of the compass card
  • B.true meridian and the magnetic meridian
  • C.magnetic meridian and the axis of the compass card
  • D.axis of the compass card and the degaussing meridian

Deviation which is maximum on intercardinal compass headings may be removed by the___.

  • A.Flinders bar
  • B.transverse magnets
  • C.fore-and-aft magnets
  • D.soft iron spheres on the sides of the compass

Deficient oxygen content inside a chain locker can be detected with ______.

  • A.litmus paper
  • B.a combustible gas indicator
  • C.an oxygen breathing apparatus
  • D.an oxygen indicator

Deviation in a compass is caused by the ______.

  • A.vessel’s geographic position
  • B.vessel’s heading
  • C.earth’s magnetic field
  • D.influence of the magnetic materials of the vessel

Deballasting a double bottom has what affect on KG? ______.

  • A.KG is increased
  • B.KG is decreased
  • C.KG is not affected
  • D.KG increases at light drafts and decreases at deep drafts

Defense plans may cause the operation of electronic aids to navigation to be suspended with

  • A.no notice
  • B.one day’s notice
  • C.a week’s notice
  • D.thirty (30) days notice
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