单项选择题
When using the term limber system one is referring to a（）.
A.Cleaning system
B.Drainage system
C.Strengthening system
D.Weight reduction system
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相关考题
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单项选择题
When lowering manropes alongside a stage rigged over the side of a vessel，they should be allowed to trail in the water（）.
A.to easily remove the kinks that form in the lines
B.to allow the seamen on the stage to know the direction and strength of the current
C.to provide the seaman something to hold onto if he or she falls from the stage into the water
D.only for short periods of time since they will become waterlogged and be very heavy to pull up -
单项选择题
What type of stern tube bearing has the least friction（）.
A.Oil-lubricated bearings
B.Lignum vitae
C.Hard rubber
D.Bronze bushings -
单项选择题
What is a cofferdam（）.
A.Tube fitted to an ullage hole
B.Area the product is loaded into
C.Void or empty space separating two tanks
D.Opening in the deck used for cleaning a tank
