单项选择题
A.high pressure fluid accumulators B.driving air-powered plunger pumps C.filling open-circuit breathing systems D.bladder-type accumulators
Class I and II private aids to navigation in or along n...
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
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
