A.switching
B.alternating
C.oscillating
D.fluctuating
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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
A.True position
B.True meridian
C.True course
D.True bearing
最新試題
A mid-channel buoy，if lighted，will show a（）.
Branford reef is（）.
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 preferred-channel buoy will show a（）.
A special purpose buoy shall be（）.
A plane that cuts the Earth’s surface and passes through the poles will always form（）.
A plane that cuts the Earth’s surface at any angle and passes through the center will always form（）.
A white buoy with a blue band is（）.
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（）.