ready for entrance
ready for entrance，but gates cannot be closed completely
being made ready for entrance
not ready for entrance
单选题When entering from seaward，a buoy displaying a single-flashing red light would indicate （）.A a junction with the preferred channel to the leftB a sharp turn in the channel to the rightC the starboard side of the channelD a wreck to be left on the vessel's port side
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单选题A preferred-channel buoy will show a（）.A white light whose characteristic is Morse (A)B group-occulting white lightC composite group-flashing (2 + 1) white lightD composite group-flashing (2 + 1) red or green light
单选题A message by flashing light consists of the call，the text，the ending，and the（）.A identityB time of originC replyD procedure code
单选题A flashing red light displayed at a single lock means that the lock（）.A is ready to use but vessels must stand clearB is ready to use and vessels may approachC cannot be made ready immediately and vessels shall stand clearD cannot be made ready immediately but vessels may approach
单选题A flashing light is a light that（）.A flashes at regular intervals at a frequency of 120 flashes or more per minuteB is yellow in colorC is visible over an arc of the horizon of not less than 180°nor more than 225°D All of the above
单选题A towing light is a yellow light having the same characteristics as a(n)（）A special flashing lightB anchor lightC sternlightD masthead light
单选题A vessel engaged in trawling will show identification lights of（）.A a red light over a white lightB a white light over a red lightC a green light over a white lightD two red lights in a vertical line
