单项选择题

A 200-meter vessel is aground in fog. Which signal is optional? （）

A.A bell signal
B.A gong signal
C.A whistle signal
D.All of the above

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单项选择题

A vessel will NOT show sidelights when（）.

A.underway but not making way
B.making way，not under command
C.not under command，not making way
D.trolling underway

单项选择题

Two short blasts of the whistle have all of the following meanings EXCEPT（）.

A.I intend to meet you starboard to starboard
B.I do not intend to hold course and speed
C.I intend to overtake you on your port side
D.I intend to alter my course to port

单项选择题

Which vessel，when anchored at night，is NOT required to show anchor lights?（）.

A.A power-driven vessel
B.A vessel engaged on pilotage duty
C.A vessel dredging
D.A vessel restricted in her ability to maneuver