The double bottom in a vessel is a space comprised of （）

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• It is possible to mount a double suction centrifugal pump impeller with the vanes facing in the wrong directionThis would cause the pump （）.

  A . head capacity to improve B . discharge to be reversed C . efficiency to decrease D . slippage to decrease

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• Longitudinal and transverse separtions between the tanks,which are used to prevent liquids from leaking from one double bottom tank into the other ,are called（）.

  A . double bottoms B . cofferdam C . navigating bridge D . superstructure

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• In a typical fuel system, the oil is stored in （） in the double bottom.

  A . setting tanks B . service tanks C . tanks D . drain tank

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• A double suction centrifugal pump impeller has been installed in the reverse direction, and will （）.

  A . have a greater head capacity B . operate with increased impeller efficiency C . discharge through the suction side of the pump casing D . require more power to run the shaft

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• The sequence of parts in a generally used fuel oil supply system for a main engine is （） (1)tanks in the double bottom (2)centrifuges (3)service tank (4)settling tank (5)viscosity regulator

  A . (1)-(2)-(4)-(3)-(5) B . (1)-(4)-(2)-(3)-(5) C . (1)-(3)-(2)-(4)-(5) D . (1)-(5)-(4)-(2)-(3)

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• The ocean bottom that extends from the shoreline out to an area where there is a marked change in slope to a greater depth is the（）.

  A . abyssal plain B . continental shelf C . borderland D . offshore terrace

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• The（）has a built-in world map; most areas are displayed on a scale of 4000 nm from the top to the bottom of the screen，and can be zoomed in to 150 nm.

  A . chartplotter B . C-MAP NT C . C-Cards D . PPI

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• The exhaust valve opens before bottom dead center in a four stroke engine to（） Ⅰ.allow for blow down Ⅱ.Reduce pumping losses

  A . Ⅰ only B . Ⅱ only C . both Ⅰ and Ⅱ D . neither Ⅰ nor Ⅱ

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• In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the （）.

  A . crosshead B . crankpin C . crank journal D . gudgeon pi

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• Such an engine frame helps （） the engine and so protect the bearings from the deformation forces transmitted via the ships double bottom.

  A . to stiffen B . to soften C . to loosen D . to wear

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• Deballasting a double bottom has what affect on KG（）.

  A . KG is increased B . KG is decreased C . Kgis not affected D . KG increases at light drafts and decrease at deep draft

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• The system of valves and cargo lines in the bottom piping network of a tank vessel that connects one section of cargo tanks to another section is called a（）.

  A . crossover B . runaround C . come-along D . manifold

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• A term applied to the bottom shell plating in a double-bottom ship is（）.

  A . bottom floor B . outer bottom C . shear plating D . tank to

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• In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a （） in the crankshaft to the bottom end bearing andthen up a connection rod to the gudgeon pin.

  A . telescopic pipes B . large bore C . drilled passage D . tied rod

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• By day，you sight a vessel displaying three shapes in a vertical line. The top and bottom shapes are balls，and the middle shape is a diamond. It could be a（）.

  A . vessel trolling B . mineclearing vessel C . trawler D . vessel engaged in replenishment at sea

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• The best method to stop a vessel from dragging anchor in a sand bottom is to（）.

  A . reduce the length of the cable B . pay out more anchor cable C . back the engines D . swing the rudder several times to work the anchor into the bottom

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• Deballasting a double bottom has what affect on KG?（）.

  A . KG is increased B . KG is decreased C . KG is not affected D . KG increases at light drafts and decreases at deep draft

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• The system of valves and cargo lines in the bottom piping network of a tanker that connects one section of cargo tanks to another section is called a（）.

  A . come-along B . crossover C . manifold D . runaround

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• In a typical fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to （） and heated.

  A . a service tank B . a collecting tank C . a sump D . a settling tank

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• If no item can be opened, the icon has a small red “X” in left-hand corner of the bottom.

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• Artificially low interest rates have caused a slump in the lira(里拉：意大利货币) (down 55% in the past four years), pushed inflation up to double digits and led firms to overload themselves with debt. （Economist）

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• The exhaust valve opens before bottom dead center in a four stroke engine to______Iallow for blow down IIReduce pumping losses

  A.I only B.II only C.both I and II D.neither I nor II

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• 听力原文：M: Do you have any double rooms with a view of the harbor available？ We'd like to check in this afternoon.

  W: I'm pretty sure we have one left, but it's only available for tonight. Q: What is the man trying to do？ (18) A．Tour the harbor. B．Find accommodations. C．Check out of a hotel. D．Pay a bill.

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• American high school students sink almost to the bottom in a survey of math and science literacy because too many of the high school ______ in America are not qualified.

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