單項(xiàng)選擇題While underway，in fog，you hear a whistle signal of one prolonged blast followed by two short blasts. This signal is sounded by a vessel（）.

A.not under command
B.being towed
C.on pilotage duty
D.aground


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1.單項(xiàng)選擇題Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the Light List in which of the following manners?（）

A.Geographical positions outlining the area of the sector
B.True bearings as observed from the ship toward the light
C.An outline of the area of the sector
D.True bearings as observed from the light toward the ship

2.單項(xiàng)選擇題The prohibition against displaying lights which may be confused with required navigation lights applies（）.

A.from sunset to sunrise and during restricted visibility
B.only when other vessels are in the area
C.only when operating in a traffic separation scheme
D.only when under tow

3.單項(xiàng)選擇題A vessel towing is showing three forward white masthead lights in a vertical line. This means that the length of the（）.

A.towing vessel is less than 50 meters
B.towing vessel is greater than 50 meters
C.tow is less than 200 meters
D.tow is greater than 200 meters

4.單項(xiàng)選擇題During the day，a vessel with a tow over 200 meters in length will show（）.

A.a black ball
B.a diamond shape
C.two cones，apexes together
D.one cone，apex upward

6.單項(xiàng)選擇題Approaching an anchorage in fog，you hear one short，one prolonged，and one short blast in that sequence on a ship’s whistle． This indicates（）.

A.A vessel towed
B.A vessel not under command and unable to maneuver
C.A vessel anchored giving warning of her position
D.A vessel stopped dead in the water

7.單項(xiàng)選擇題A towing light is a yellow light having the same characteristics as a(n)（）

A.special flashing light
B.anchor light
C.sternlight
D.masthead light

8.單項(xiàng)選擇題At sea，you are approaching a small vessel and see that it has the signal flag P hoisted. What should you do?（）.

A.Proceed on present course and speed since the vessel is stopped and making no way through the water
B.Keep clear of the vessel because it has a diver down
C.Attempt to call the vessel on VHF radiotelephone because someone on board requires medical assistance
D.Approach with caution because the vessel is a fishing vessel and its nets are fouled on an obstruction

9.單項(xiàng)選擇題A tug is towing three manned barges in line in fog. The first vessel of the tow should sound （）.

A.no fog signal
B.one short blast
C.one prolonged and three short blasts
D.one prolonged，one short，and one prolonged blast

10.單項(xiàng)選擇題All fog signals shall be sounded every two minutes with the exception of a vessel（）.

A.underway or making way
B.under sail or under tow
C.anchored or aground
D.not under command or restricted in her ability to maneuver