單項選擇題

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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單項選擇題

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

單項選擇題

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

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A power-driven vessel pushing aheador towing alongside displays navigation lights and（）.

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A power-driven vessel leaving a quay or wharf must sound what signal? （）

A light used to signal passing intentions must be an（）.