A power-driven vessel underway shall exhibit the following light signals EXCEPT ___ . A. a masthead light forward B. sidelights C. a stern light D. two all-round lights in a vertical line and three balls in a vertical line

单选题

A head on situation shall be deemed to exist at night when a power-driven vessel sees another power-driven vessel ahead and ___ .A. one sidelight and the masthead light are visibleB. the vessels will pass closer than half a mileC. both vessels sound one prolonged blastD. both sidelights and masthead light(s) are visible

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单选题

A vessel is ____ when she is not at anchor, made fast to the shore, or aground.A. underway B. making wayC. dead in the water D. a power-driven vessel

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