A.wreck
B.shoal area
C.anchorage area
D.middle ground
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A.fixed red light
B.flashing light
C.white light
D.occulting light
A.directions
B.dangers
C.exclusion areas
D.All of the above
A.danger
B.vessels are excluded from the area
C.the buoy is a mooring buoy
D.operating restrictions are in effect
A.an isolated danger mark
B.a hydrographic data collection buoy
C.a mooring buoy
D.marking a restricted area
A.submerged rock，not dangerous to navigation
B.sunken wreck，not dangerous to navigation
C.towed-under buoy
D.All of the above
最新試題
A structure，usually made of stone，or cement pilings，which extends from the bank at approximately right angles to the current is called a（）.
A relative bearing is always measured from（）.
How is the intensity of a light expressed in the Light Lists?（）.
A nun buoy will（）.
An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol? （）
A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）
Buoys which mark dredging areas are painted（）.
A V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.
Except for N-S courses，and E-W courses on the equator，a great circle track between two points，when compared to a rhumb line track between the same two points，will（）.
A parallel of latitude other than the equator is a（）.