Uncharted lights, fog signals and radar beacon transmissions may be ______ near the station．

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• 1When a buoy marks a channel bifurcation(分支), the preferred channel is NOT indicated by ______．

  A.the shape of an unlighted buoy

  B.the light color of a lighted buoy

  C.the color of the topmost band

  D.whether the number is odd or even

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• 2The shortest distance between any two points on earth defines a ______．

  A.small circle

  B.great circle

  C.rhumb line

  D.hyperbola

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• 3The two vessels underway may collide with ______,if they don't take immediate measures．

  A.one to another

  B.one the other

  C.each the other

  D.each other

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• 4When underway in a channel,you should keep to the ______．

  A.middle of the channel

  B.starboard side of the channel

  C.port side of the channel

  D.side of the channel that has the widest turns

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• 5All of the following are engaged in fishing EXCEPT ______．

  A.A vessel trawling

  B.A vessel trolling

  C.A vessel setting nets

  D.A vessel tending lines

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• 6Spring tides occur ______．

  A.when the moon is new or full

  B.when the moon and sun have declination of the same name

  C.only when the moon and sun are on the same sides of the earth

  D.at the beginning of spring when the sun is over the equator

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• 7The set of the ocean current is caused by ______．

  A.density differences of the water

  B.rotation of the earth

  C.direction of primary circulation of air

  D.all of the above

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• 8You are docking a vessel．If possible,you should ______．

  A.go in with the current

  B.go in against the current

  C.approach the dock at a 90Deg angle and swing to

  D.at the beginning of spring when the sun is over the equator

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• 9All the holds to be loaded with grain must be swept ______ commencement of loading．

  A.cleanly／during

  B.clear／meanwhile

  C.clean／between

  D.clean／prior to

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• 10Stop ______ the derrick at once，the gooseneck is bent．

  A.to use

  B.to operate

  C.maneuvering

  D.using

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