单项选择题
A.Sailing Directions B.Light List C.List of Private Aids D.Aids to Navigation Manual
Chronometer error may be found by（）.A.radio time signal...
单项选择题Chronometer error may be found by（）.
A.radio time signal B.comparison with a timepiece of known error C.applying the prevailing chronometer rate to previous readings D.All of the above
Charts showing the coast of Mexico are produced by the ...
单项选择题Charts showing the coast of Mexico are produced by the United States（）.
A.National Geospatial-Intelligence Agency B.Coast Guard C.Naval Observatory D.National Ocean Service
Chart legends which indicate a conspicuous landmark are...
单项选择题Chart legends which indicate a conspicuous landmark are printed in（）.
A.underlined letters B.capital letters C.italics D.boldface print
