A.on the prime vertical
B.on the celestial horizon
C.at lower transit
D.on the Greenwich meridian
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A.quarter line
B.back line
C.peg line
D.jockey line
A.scissor wire
B.towing wire
C.breast wire
D.cross wire
A.List of Lights
B.Coast Pilot
C.Sailing Directions
D.List of Radiobeacons
A.giving
B.give
C.gives
D.given
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A sweep oar is an oar that is（）.
Aboard a survival craft，ether can be used to（）.
A vessel in distress should send by radio telephone the two tone alarm signal followed immediately by the（）.
The light vessel is reported（）.
An orange flag showing a black circle and square is a（）.
The Lists of Meteorological Observation Stations can be found in（）.
Mariners not entering the port are（）to keep at least one mile off.
The daily predictions of the times and heights of high and low water for a selection of Standard Ports are given in（）.
The latest known details of lights are given in（）.
The program of graphical predictions of height against time for a period of up to seven consecutive days is contained in（）.