單項(xiàng)選擇題Kort nozzles are installed around the propellers of some vessels to().

A.Increase the thrust of the propeller
B.Protect the propeller from striking sawyers
C.Prevent the propeller from striking barges towed on the ship
D.Prevent the propeller from touching bottom in low water


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3.單項(xiàng)選擇題Electric generators can be protected against overload().

A.With switches
B.With a governor on the engine
C.With fuses or circuit breakers
D.By using heavy wire

4.單項(xiàng)選擇題Deadweight,which is the cargo carrying capacity of a vessel in tons,is determined by().

A.Loaded displacement minus light displacement
B.Gross tonnage minus net tonnage
C.Loaded displacement minus net tonnage
D.Light displacement minus the weight of the vessel

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