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單項(xiàng)選擇題

A heavy steel curved arch constructed athwartships and above the after deck on a towing vessel is sometimes called a（）.

A.main brace
B.tow span
C.jockey bar
D.None of the above

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單項(xiàng)選擇題

A head-on situation at night is one in which you see dead ahead a vessel showing（）.

A.one sidelight
B.one sidelight and a masthead light
C.one sidelight and two masthead lights
D.both sidelights of a vessel and her masthead light(s)

單項(xiàng)選擇題

A hand held instrument used to measure distances between objects and the ship is a（）.

A.vernier
B.psychrometer
C.hygrometer
D.stadimeter