航海英语号灯与号型章节练习(2019.04.25)

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
A single towing light will be carried above a vessel’s sternlight（）.
A.only if she is towing astern
B.only if the tow exceeds 200 meters
C.at any time when towing
D.if the towing vessel is part of a composite unit
单项选择题
A vessel towing where the tow prevents her from changing course shall carry（）.
A.only the lights for a vessel towing
B.only the lights for a vessel restricted in her ability to maneuver
C.the lights for a towing vessel and the lights for a vessel restricted in her ability to maneuver
D.the lights for a towing vessel and the lights for a vessel not under command
单项选择题
A vessel being towed astern，where the length of the tow exceeds 200 meters，will exhibit （）.
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
单项选择题
A red triangular daymark marks（）.
A.the centerline of a navigable channel
B.the starboard side of a channel
C.a prominent object of navigational interest that has no lateral significance
D.area of a channel where passing another vessel is permitted
单项选择题
A power-driven vessel not under command at night must show her sidelights when（）.
A.making headway
B.making no headway
C.moored to a buoy
D.at anchor
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
单项选择题
Two short blasts of the whistle have all of the following meanings EXCEPT（）.
A.I intend to meet you starboard to starboard
B.I do not intend to hold course and speed
C.I intend to overtake you on your port side
D.I intend to alter my course to port
单项选择题
While underway，in fog，you hear a whistle signal of one prolonged blast followed by two short blasts. This signal is sounded by a vessel（）.
A.not under command
B.being towed
C.on pilotage duty
D.aground
单项选择题
Entering from seaward，triangular-shaped daymarks are used to mark（）.
A.the starboard side of the channel
B.the centerline of the channel
C.an obstruction where the preferred channel is to starboard
D.special purpose areas