A.flashing
B.pulsating
C.occulting
D.alternating
您可能感興趣的試卷
你可能感興趣的試題
A.switching
B.alternating
C.oscillating
D.fluctuating
A.sharp turn in the channel
B.narrowing in the channel at that point
C.junction in the channel
D.obstruction that must be left to port
A.should be passed close aboard on either side
B.indicates that special caution is required
C.is used at a channel bifurcation or junction
D.is painted with red and white vertical stripes
A.easterly courses in high latitudes
B.southerly courses in high latitudes
C.westerly courses in low latitudes
D.easterly courses in low latitudes that cross the equator
A.plane tangent at one point
B.cylinder tangent at the equator
C.cone tangent at one parallel
D.infinite series of cones tangent at selected parallels
最新試題
A plane that cuts the Earth’s surface at any angle and passes through the center will always form（）.
A white buoy with an orange rectangle on it displays（）.
An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol? （）
A vessel is（）when she is not at anchor，made fast to the shore，or aground.
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 V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.
A preferred-channel buoy will show a（）.
A white buoy with a blue band is（）.
A spherical buoy may be（）.
A special mark (yellow buoy)，if lighted，may exhibit which light rhythm?（）