A.matching pulse rates of at least 20 stations
B.an automatic on-and-off switch
C.a horizontal matching of all delayed hyperbolic signals
D.automatic signal acquisition and cycle matching
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最新试题
A chart projection depicting the poles and a small area on either side of a connecting meridian,that is sometimes used for star charts,is the().
A “loose” tow may cause all of the following EXCEPT().
A crew member reports that the high-pressure alarm light of a low-pressure CO2 fixed fire extinguishing system is illuminated. The most probable cause of this condition would be that().
A chart position enclosed by a square is a(n)().
A “sheepshank” is used to().
A “liner” in riveted construction of a vessel is a(n) ().
A change of a documented vessel’s name can only be made by the().
A copy of the Articles of Agreement,less the signatures,is required to be posted. This document is called the().
A chain bridle is used when towing astern because it().
A casualty report of an intentional grounding of a ship is required under what condition?()