A vessel may exhibit lights other than those prescribed by the Rules as long as the additional lights（）.

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• A fishing vessel displaying the lights shown is（）.

  A . anchored B . underway but not fishing C . tending a small fishing boat D . fishing by trawling

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• A vessel showing a yellow light over a white light at night is a vessel（）.

  A . engaged in piloting B . towing astern C . engaged in fishing D . in distre

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• A vessel showing a green light over a white light in a vertical line above the level of the sidelights is（）.

  A . engaged in underwater construction B . under sail and power C . a pilot vessel D . trawling

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• A vessel aground at night is required to show two red lights in a vertical line as well as （）.

  A . not under command lights B . restricted in her ability to maneuver lights C . anchor lights D . sidelights and a sternlight

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• The characteristic of a lighted cardinal mark may be （）.

  A . very quick flashing B . flashing C . fixed D . occulting

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• A vessel may enter a traffic separation zone（）.

  A . in an emergency B . to engage in fishing within the zone C . to cross the traffic separation scheme D . All of the above

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• The Light List shows a lighted aid to navigation on the left bank. This means that the light can be seen on the starboard side of a vessel（）.

  A . ascending the river B . descending the river C . crossing the river D . proceeding towards sea

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• A vessel constrained by her draught may，in addition to the lights prescribed for power-driven vessels in Rule 23，exhibit where they can best be seen（）or a cylinder.

  A . two all-round red lights in a vertical line B . three all-round red lights in a vertical line C . two all-round yellow lights in a vertical line D . three all-round green lights in a vertical line

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• If a towing vessel and her tow are severely restricted in their ability to change course，they may show lights in addition to their towing identification lights. These additional lights may be shown if the tow is（）.

  A . pushed ahead B . towed alongside C . towed astern D . Any of the above

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• A vessel is overtaking when she can see which light(s) of a vessel ahead?（）

  A . Only the stern light of the vessel B . One sidelight and a masthead light of the vessel C . Only a sidelight of the vessel D . The masthead lights of the vessel

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• A towing vessel pushing a barge ahead and rigidly connected in a composite unit shall show the lights of（）.

  A . a vessel towing by pushing ahead B . a power-driven vessel，not towing C . a barge being pushed ahead D . either answer A or answer B

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• A vessel displaying three red lights in a vertical line is（）.

  A . restricted in her ability to maneuver B . not under command C . engaged in mineclearing operations D . constrained by her draft

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• You see a vessel displaying three lights in a vertical line.The highest and lowest lights are red and the middle light is white.She is also showing a white light at the stern，which is lower than the forward light.It could be a（）.

  A . Survey vessel B . Vessel not under command C . Vessel aground D . Pilot vessel with port side to you

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• A list signal of one white light indicates that the vessel is （）.

  A . on an even keel B . listing about 1° to the side the light is displayed on C . listing over 5° With the light displayed on the high side D . listing，and the chutes should be directed to the side where the light is displayed

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• A pilot vessel on pilotage duty at night will show sidelights and a stern light （）.

  A . when at anchor B . only when making way C . at any time when underway D . only when the identifying lights are not being show

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• A vessel constrained by her draft may display（）.

  A . three all-round red lights instead of the lights required for a power-driven vessel of her class B . the same lights as a vessel restricted in her ability to maneuver C . three all-round red lights in addition to the lights required for a power-driven vessel of her class D . the lights for a power-driven vessel which is not under command

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• A vessel may exhibit lights other than those prescribed by the Rules as long as the additional lights（）.

  A . do not interfere with the keeping of a proper look-out B . are not the color of either sidelight C . have a lesser range than the prescribed lights D . All of the above

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• A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）

  A . Flashing B . Morse A C . Equal interval D . Occulting

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• The nominal range of a light may be accurately defined as the maximum distance at which a light may be seen（）.

  A . under existing visibility conditions B . under perfect visibility C . with ten miles visibility D . with fifteen miles visibility

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• You may improve a vessels stability by （）.

  A . keeping the fuel tanks topped off B . increasing the free surface effect C . keeping the fuel tanks at least half MI D . keeping at least one fuel tank empty for slo

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• An all-round flashing yellow light may be exhibited by a(n)（）.

  A . vessel not under command B . air cushion vessel in the nondisplacement mode C . vessel towing a submerged object D . vessel engaged in diving operatio

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• At night you observe a vessel ahead show three flashes of a white light. This signal indicates that the vessel ahead is（）.

  A . in distress B . approaching a bend in the channel C . operating astern propulsion D . intending to overtake another vessel

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• If a towing vessel and her tow are severely restricted in their ability to change course，they may show lights in addition to their towing identification lights.These additional lights may be shown if the tow is ().

  A.pushed ahead B.towed alongside C.towed astern D.Any of the above

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