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
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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
A.be a stopper
B.shorten a line
C.join lines of equal size
D.keep a line from passing through a sheave
A.there are fifteen pounds of CO2 in the container
B.the container，when full，weighs fifteen pounds
C.the pressure at the discharge nozzle is l5 psi
D.the empty container weighs fifteen pounds
A.a safety line attached to a man working over the side
B.used to measure water depth
C.used to slow the headway of a barge
D.used to measure the overhead height of a bridge
A.join lines of equal size
B.form a temporary eye (loop) at the end of a line
C.be a stopper
D.keep a line from fraying
A continual worsening of the list or trim of any floating ship indicates（）.
A “sheepshank” is used to（）.
A casualty report of an intentional grounding of a ship is required under what condition?（）
A “l(fā)iner” in riveted construction of a vessel is a(n)（）.
A common class of wire rope used for mooring is the 6x19 class. What does the 6 represent?（）
A chain bridle is preferable to a wire rope towing bridle on a long ocean tow because chain（）.
A “reaching” course is one in which the wind（）.
A crew member is having an epileptic convulsion. You should（）.
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 celestial body will cross the prime vertical circle when the latitude is numerically（）.