單項(xiàng)選擇題A common class of wire rope used for mooring is the 6x19 class. What does the 6 represent?()

A.Factor of safety
B.Number of wires per strand
C.Number of strands per wire rope
D.Number of wires in the core


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1.單項(xiàng)選擇題A CO2 extinguisher on a ship which has lost 10% of its charge must be().

A.used at the earliest opportunity
B.hydro-tested
C.recharged
D.weighed again in one month

2.單項(xiàng)選擇題A chart with a scale of 1:80,000 would fall into the category of a().

A.sailing chart
B.general chart
C.coastal chart
D.harbor chart

3.單項(xiàng)選擇題A chart with a natural scale of 1:160,000 is classified as a().

A.sailing chart
B.general chart
C.coast chart
D.harbor chart

4.單項(xiàng)選擇題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.azimuthal gnomonic projection
B.Lambert conformal projection
C.transverse Mercator projection
D.polyconic projection

5.單項(xiàng)選擇題A chart position enclosed by a square is a(n)().

A.fix
B.estimated position
C.dead reckoning position
D.running fix