单项选择题
A sailing vessel shall not impede the safe passage of a（）.
A.power-driven vessel following a traffic lane
B.pilot vessel enroute to a pilot station
C.law enforcement vessel
D.All of the above
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相关考题
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单项选择题
A sailing vessel is overtaking a power-driven vessel in a narrow channel，so as to pass on the power-driven vessel’s port side. The overtaken vessel will have to move to facilitate passage. The sailing vessel is the（）.
A.stand-on vessel and would sound two short blasts
B.give-way vessel and would sound no whistle signal
C.stand-on vessel and would sound no whistle signal
D.give-way vessel and would sound two prolonged blasts followed by two short blasts -
单项选择题
A power-driven vessel pushing aheador towing alongside displays navigation lights and（）.
A.two all-round red lights in a vertical line
B.two yellow towing lights in a vertical line
C.two white masthead lights in a vertical line
D.two lights on the stern，one yellow and one white -
单项选择题
A power-driven vessel leaving a quay or wharf must sound what signal? （）
A.Three short blasts
B.A long blast
C.A prolonged blast
D.No signal is required
