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

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• 1When 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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• 2All 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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• 3Where one of two vessels is to keep out of the way the other ______．

  A.shall not keep her course but shall keep her speed

  B.shall not keep her course and speed

  C.shall keep her course but change her speed

  D.shall keep her course and speed

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• 4A tug would NOT assist a ship to steer if the tug is made up to the large vessel ______．

  A.by a tow line ahead of the vessel

  B.forward on either bow of the vessel

  C.approximately amidships of the vessel

  D.on the vessel's quarter

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• 5Mariners proceeding across the main routes are ______ to do so as wide an angle aspracticable．

  A.recommended

  B.reported

  C.applied

  D.complied

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• 6The 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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• 7When 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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• 8Uncharted lights, fog signals and radar beacon transmissions may be ______ near the station．

  A.encountered

  B.met

  C.contacted

  D.seen

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• 9Spring 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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• 10The 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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