A、A flashing light combined with a fixed light of greater brightness
B、Light flashes combined in groups，with a different number of flashes in each group
C、A light showing groups of two or more flashes at regular intervals
D、A fixed light varied at regular intervals by groups of two or more flashes of greater brightness
更多“On navigational aids，what does the light characteristic Fl(2+1) mean?（）”相关的问题
A、IALA Buoyage system B、hydrography，topography，navigational aids and their services C、basic meteorology and navigation in ice and hazards and restrictions to navigation D、information on tides，currents and characteristics of the sea
A、the letters ICW after the aid's number or letter B、yellow stripes，squares，or triangles marked on them C、white retroreflective material D、the light characteristic and color for lighted aids
A、A.continue to be responsible for the safe navigation of the ship B、B.Leave the bridge C、C.Keep the watch on the bridge D、D.Use any available navigational aids necessary to ensure that the ship follows the planned course
A、can always rely on a buoy to be on station B、can always rely on a buoy to show proper light characteristics C、should assume a wreck buoy is directly over the wreck D、should never rely on a floating aid to maintain its exact position
A、Can always rely on a buoy to be on station B、Can always rely on a buoy to show proper light characteristics C、Should assume a wreck buoy is directly over the wreck D、Should never rely on a floating aid to maintain its exact position
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