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
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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 -
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 -
单项选择题
Chart legends printed in capital letters show that the associated landmark is（）.
A.inconspicuous
B.conspicuous
C.a government facility or station
D.a radio transmitter
