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
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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
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
A.A power-driven vessel
B.A vessel engaged on pilotage duty
C.A vessel dredging
D.A vessel restricted in her ability to maneuver
A.not under command
B.being towed
C.on pilotage duty
D.aground
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Daymarks marking the starboard side of the channel when going towards the sea are（）.
A power-driven vessel towing another vessel astern (tow less than 200 meters) shall show （）.
An inconspicuous，partly submerged vessel or object being towed，where the length of tow is 100 meters，shall show（）.
The prohibition against displaying lights which may be confused with required navigation lights applies（）.
A towing light is a yellow light having the same characteristics as a(n)（）
Environmental loading consists of the forces caused by wind，waves，and（）.
A towing light，according to the Rules，is a（）.
The International Regulations for Preventing Collisions at Sea contain the requirements for （）.
A triangular daymark would be colored（）.
On entering from seaward，a starboard side daymark will（）.