单项选择题

A “loose” 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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单项选择题

A “liner” 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

单项选择题

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

单项选择题

A “figure eight” knot is used to（）.

A.be a stopper
B.shorten a line
C.join lines of equal size
D.keep a line from passing through a sheave