單項(xiàng)選擇題Our ship is more than 150 meters in().

A.height
B.breadth
C.depth
D.length


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1.單項(xiàng)選擇題Our jumbo boom can()20 tons.

A.lift
B.rise
C.elevate
D.hoist

2.單項(xiàng)選擇題On which type davit does the davit head stay at the same height?()

A.Radial
B.Sheath-screw
C.Quadrantal
D.Gravity

3.單項(xiàng)選擇題On what type of pump would you find an impeller?()

A.Centrifugal
B.Gear
C.Piston
D.Vane

4.單項(xiàng)選擇題On navigational aids,what does the light characteristic Fl(2+1) mean?()

A.A flashing light combined with a fixed light of greater brightness
B.Light flashes combined in groups,with a different number of flashes in each group
C.A light showing groups of two or more flashes at regular intervals
D.A fixed light varied at regular intervals by groups of two or more flashes of greater brightness

5.單項(xiàng)選擇題On cargo booms,preventers are().

A.auxiliary guys
B.extra fair leads
C.steel bands
D.stops