A.dead-reckoning position
B.running fix
C.estimated position
D.fix
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A.fix
B.dead-reckoning position
C.running fix
D.probable position
A.plane tangent at one point
B.cylinder tangent at one parallel
C.cone tangent at one parallel
D.series of cones tangent at selected parallels
A.when at anchor
B.only when making way
C.at any time when underway
D.only when the identifying lights are not being shown
A.aground
B.at anchor
C.not under command
D.being towed
A.average wind conditions
B.tidal currents
C.magnetic variation
D.average limits of field ice
最新試題
Lines drawn through points on the Earth having the same atmospheric pressure are known as （）.
The Lists of Meteorological Observation Stations can be found in（）.
The program of graphical predictions of height against time for a period of up to seven consecutive days is contained in（）.
Many of the lights on this coast are placed so high as to be frequently obscured by（）.
The daily predictions of the times and heights of high and low water for a selection of Standard Ports are given in（）.
The light vessel is reported（）.
The information on ocean voyage planning with routeing details for powered and sailing vessels is likely found in（）.
Mariners not entering the port are（）to keep at least one mile off.
After being launched from a vessel，totally enclosed survival craft which have been afloat over a long period require（）.
After the boat is at the top of the davit heads，the davit arms begin moving up the tracks and are stopped by the（）.