單項(xiàng)選擇題

A “l(fā)oose” tow may cause all of the following EXCEPT（）.

A.loss of maneuverability
B.lines to part
C.damage to the towing vessel and tow
D.a saving in the transit time

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A “l(fā)iner” in riveted construction of a vessel is a(n)（）.

A.small plate which fills the aperture between riveted strakes and the vessel framing
B.backing plate which is used to level the strakes while riveting，and then removed
C.internal frame to which the side shell is riveted
D.seam that is welded after riveting is completed

單項(xiàng)選擇題

A “full service” Loran-C receiver will provide（）.

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