单选题A vessel not under command making way at night would show（）.A two all-round red lights in a vertical lineB anchor lights and sidelightsC two all-round white lights in a vertical line，sidelights and a stern lightD two all-round red lights in a vertical

A vessel not under command making way at night would show ______.

A.two all-round red lights in a vertical line

B.anchor lights and sidelights

C.two all-round white lights in a vertical line，sidelights and a stern light

D.two all-round red lights in a vertical line，sidelights，and a stern light

A vessel engaged in mine clearance operations is called ______.

A.a vessel restricted in her ability to maneuver

B.a vessel not under command

C.a vessel constrained by her draught

D.a vessel not under way

A pilot vessel on pilotage duty at night will show sidelights and a sternlight ______.

A.when at anchor

B.only when making way

C.at any time when underway

D.only when the identifying lights are not being shown

A vessel not under command shall display ______.

A.two red lights at night and two black balls during daylight

B.two red lights at night and three black balls during daylight

C.three red lights at night and two black balls during daylight

D.three red lights at night and three black balls during daylight

A vessel not under command sounds the same fog signal as a vessel ______.

A.engaged in towing

B.constrained by her draft

C.under sail

D.All of the above

A vessel is carrying three lights in a vertical line. The highest and lowest of these are red and the middle light is white. Which statement is always TRUE?

A.During the day，she would display three balls in a vertical line

B.If making way，she would show masthead lights at night

C.If at anchor，she need not show anchor lights while displaying identifying lights

D.Her fog signal would consist of a rapid ringing of a bell for five seconds every minute