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
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相关考题
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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 -
单项选择题
A light used to signal passing intentions must be an（）.
A.alternating red and yellow light
B.alternating white and yellow light
C.all-round white or yellow light
D.all-round white light only -
单项选择题
A fishing vessel is approaching a vessel not under command. Which statement is TRUE? （）
A.The fishing vessel must keep clear of the vessel not under command
B.If the vessel not under command is a power-driven vessel，she must keep clear of the fishing vessel
C.They must exchange whistle signals
D.Both vessels are required to take action to stay clear of each other
