On a ship，a door that is required to be marked KEEP CLOSED is designed to ______．

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• 1A Doppler log in the bottom return mode indicates the ______．

  A.velocity of the current

  B.bottom characteristics

  C.depth of the water

  D.speed over the ground

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• 2On a vessel with a single propeller,transverse force has the most effect on the vessel when the engine is put ______．

  A.full ahead

  B.full astern

  C.half ahead

  D.slow astern

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• 3After a cold front passes,the barometric pressure ______．

  A.drops,and the temperature drops

  B.drops,and the temperature rises

  C.rises,and the temperature drops

  D.rises,and the temperature rises

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• 4Which of the following is a characteristic of a Ro-Ro vessel、

  A.Passenger tours available upon docking

  B.Long port stays necessary to secure vehicles

  C.Short in port turnaround times

  D.Heavy vehicles only require lightweight securing equipment

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• 5When force of winds reaches 10-11 in Beaufort scale，we usually call such wind ______．

  A.Gale

  B.Storm

  C.Hurricane

  D.Typhoon

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• 6When navigating in thick fog with the radar on, you should ______．

  A.station the look-out in the wheelhouse to keep a continuous watch on the radar

  B.secure the sounding of fog signals until a vessel closes within five miles

  C.station a look-out as low down and far forward as possible

  D.keep the radar on the shortest available range for early detection of approaching vessels

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• 7Your radar is set on a true motion display．Which of the following will NOT appear to moveacross the PPI scope、

  A.Echoes from a buoy

  B.Own ship's marker

  C.Echo from a ship on the same course at the same speed

  D.Echo from a ship on a reciprocal course at the same speed

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• 8When hitting a solid object such as a ship or an airplane,the radar waves are reflected back ______ they came．

  A.in the way

  B.the way

  C.by the way

  D.through the path

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• 9There is a possibility that small vessel, ice and other floating objects may not be ______ by radar at an adequate range．

  A.reflect

  B.shown

  C.detected

  D.defected

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• 10Indications of the master gyrocompass are sent to remote repeaters by the ______．

  A.follow-up system

  B.transmitter

  C.phantom element

  D.azimuth motor

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