单项选择题
Clean air standards referred to as “Grade D” apply to compressed air for use in（）.
A.high pressure fluid accumulators
B.driving air-powered plunger pumps
C.filling open-circuit breathing systems
D.bladder-type accumulators
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相关考题
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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
