A.flashes at regular intervals at a frequency of 120 flashes or more per minute
B.is yellow in color
C.is visible over an arc of the horizon of not less than 180°nor more than 225°
D.All of the above
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A.A flashing amber light
B.A fixed red light
C.A white flag raised and lowered vertically
D.A flashing white light
A.A rapid ringing of a bell for 5 seconds every two minutes
B.A whistle signal of one short，one prolonged，and one short blast
C.A prolonged blast of the whistle at intervals not to exceed one minute
D.A rapid ringing of a bell for 5 seconds，preceded and followed by three separate and distinct strokes on the bell
A.a 5 second ringing of a bell forward and a 5 second sounding of a gong aft at intervals of 1 minute
B.one prolonged followed by two short blasts every 2 minutes
C.one prolonged followed by three short blasts every minute
D.one prolonged followed by three short blasts every 2 minutes
A.A bell signal
B.A gong signal
C.A whistle signal
D.All of the above
A.underway but not making way
B.making way，not under command
C.not under command，not making way
D.trolling underway
最新試題
A single towing light will be carried above a vessel’s sternlight（）.
A red triangular daymark marks（）.
On entering from seaward，a starboard side daymark will（）.
A vessel towing is showing three forward white masthead lights in a vertical line. This means that the length of the（）.
An occulting light is one in which（）.
The International Regulations for Preventing Collisions at Sea contain the requirements for （）.
Navigation lights must be displayed in all weathers from sunset to sunrise. They also（）.
A power-driven vessel towing another vessel astern (tow less than 200 meters) shall show （）.
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（）.
According to the Rules，when should lights be displayed?（）.