单项选择题A whistle signal of one prolonged,one short,one prolonged and one short blast,is sounded by a vessel().

A.at anchor
B.towing a submerged object
C.being overtaken in a narrow channel
D.in distress


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1.单项选择题A vessel using a traffic separation scheme shall().

A.only anchor in the separation zone
B.avoid crossing traffic lanes,but if obliged to do so,shall cross on a heading at as small an angle as is practical
C.avoid anchoring in areas near the termination of the scheme
D.use the separation zone for navigation through the scheme if she is hindering other traffic due to her slower speed

2.单项选择题A vessel sounds one short blast. This signal indicates the vessel().

A.intends to alter course to starboard
B.intends to pass starboard to starboard
C.is altering course to starboard
D.intends to pass port to port

3.单项选择题A vessel not under command sounds the same fog signal as a vessel().

A.towing
B.constrained by her draft
C.under sail
D.All of the above

4.单项选择题A vessel displaying three red lights in a vertical line is().

A.not under command
B.aground
C.dredging
D.constrained by her draft

5.单项选择题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

6.单项选择题A vessel constrained by her draft may display().

A.three all-round red lights
B.two 225°red lights
C.three all-round blue lights
D.two 225°blue lights

7.单项选择题A towing light is().

A.shown below the sternlight
B.white in color
C.displayed at the masthead
D.a yellow light having the same characteristics as the stern light

8.单项选择题A towing light is().

A.shown at the bow
B.white in color
C.shown in addition to the sternlight
D.an all-round light

9.单项选择题A towing light().

A.flashes at regular intervals of 50-70 flashes per minute
B.is yellow in color
C.shows an unbroken light over an arc of the horizon of not less than 180°nor more than 225°
D.All of the above

10.单项选择题A signal of one prolonged,one short,one prolonged,and one short blast,in that order is given by a vessel().

A.engaged on pilotage duty
B.in distress
C.at anchor
D.being overtaken in a narrow channel