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

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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

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

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

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

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