Clean air standards referred to as “Grade D” apply to compressed air for use in（）.

单项选择题Class I and II private aids to navigation in or along navigable waters of the United States are listed in the（）.

A.Sailing Directions
B.Light List
C.List of Private Aids
D.Aids to Navigation Manual

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

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