A.two balls in a vertical line
B.a diamond shape where it can best be seen
C.a ball on each end of the tow
D.no dayshape
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A.no fog signal
B.one short blast
C.one prolonged and three short blasts
D.one prolonged，one short，and one prolonged blast
A.red
B.red and white
C.green
D.green and white
A.One
B.Two
C.Three
D.Four
A.white light
B.red light
C.yellow light
D.blue light
A.special flashing light
B.anchor light
C.sternlight
D.masthead light
最新試題
Navigation lights must be displayed in all weathers from sunset to sunrise. They also（）.
Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the Light List in which of the following manners?（）
By night，you sight the lights of a vessel engaged in underwater operations. If an obstruction exists on the port side of the vessel，it will be marked by（）.
A vessel is fishing at anchor on the high seas. Which of the following day signals should she display if she has gear extending out over 150 meters horizontally from the vessel?（）.
A towing light is a yellow light having the same characteristics as a(n)（）
Approaching an anchorage in fog，you hear one short，one prolonged，and one short blast in that sequence on a ship’s whistle． This indicates（）.
A power-driven vessel underway shall keep out of the way of（）.
A tug is towing three manned barges in line in fog. The first vessel of the tow should sound （）.
Entering from seaward，triangular-shaped daymarks are used to mark（）.
A triangular daymark would be colored（）.