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单选题An authorized light to assist in the identification of submarines operating on the surface is a(n)（）.A blue rotating lightB intermittent flashing amber/yellow lightC flashing white lightD flashing sidelight
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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 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At 1920，the buoy forward of your starboard beam is（）.A an interrupted quick flashing buoyB Hog Island Lighted Bell BuoyC South Light BuoyD Sand Shoal Inlet Lighted Buoy A
单选题As you approach mile 659.4 AHP，you see on the right descending bank a flashing green light. This light marks（）.A a lock that is openB a sunken bargeC a dolphin，water intake and dischargeD the end of a wharf
