单项选择题

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.A vessel towed
B.A vessel not under command and unable to maneuver
C.A vessel anchored giving warning of her position
D.A vessel stopped dead in the water

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单项选择题

An occulting light is one in which（）.

A.the period of darkness exceeds the period of light
B.there is only a partial eclipse of the light
C.the periods of light and darkness are equal
D.the period of light exceeds the period of darkness

单项选择题

An inconspicuous，partly submerged vessel or object being towed，where the length of tow is 100 meters，shall show（）.

A.yellow lights at each end
B.two red lights in a vertical line
C.a black ball
D.a diamond shape

单项选择题

An all-round flashing yellow light may be exhibited by a(n)（）.

A.vessel not under command
B.air cushion vessel in the nondisplacement mode
C.vessel towing a submerged object
D.vessel engaged in diving operations