In each cylinder cover is a large central opening for mounting （）

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• A common rail engine has only one or two high pressure pumps in operation at the same（）time, and the injection into each cylinder.

  A . can’t be controlled very precisely B . can’t be controlled as flexibly as the separate pump system C . can be controlled as flexibly as the separate pump system D . can be controlled more precisely and flexibly

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• In some type of two-stroke engines, besides some small holes for（）, starting valve, safety valve, indicator cock, and central opening in each cylinder cover for mounting the（）

  A . fuel valves；exhaust valve B . exhaust valves；inlet valve C . fuel valves；inlet valve D . exhaust valves；fuel valve

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• Each cylinder in a two stroke cycle engine experiences combustion（）.

  A . once each crankshaft revolution B . twice each crankshaft revolution C . every other crankshaft revolution D . every fourth stroke

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• Each cylinder is closed at the top by a （）, made of a special heat-resistant steel.

  A . cylinder liner B . coupling flange C . cylinder cover D . piston crow

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• The amount of fuel delivered for each cycle must be in accordance with the engine load, and the same quantity of fuel must be delivered to each cylinder for each power stroke at that load.Which of the following statements describes this requirement?（）

  A . Proper timing B . Accurate metering C . Suitable injection rate D . Suitable atomization rate

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• It is very necessary that each cylinder （） before the charged air is compressed.

  A . is scavenged B . is atomized with fuel oil C . be scavenged D . be atomized with fuel oil

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• The cylinder cover is not provided with （）.

  A . fuel valve B . lubricator C . indicator valve D . the starting valve

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• The main factor which determines the output of each cylinder is （）

  A . the cylinder weight B . the cylinder bore C . the cylinder length D . the cylinder cover

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• It is very important that each cylinder should be （） scavenged before the charged air is compressed.

  A . well B . good C . excellent D . respectively

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• In a common rail engine, the fuel is injected into cylinders（）

  A . by injection pumps B . at a time decided by the injection pump timing C . by a signal opening the magnetic valves D . at a time decided by the cam directly

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• Fuel is ignited in a diesel engine cylinder by （）

  A . a spark plug B . injectors C . the heat of compression D . increasing jacket water temperature

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• Cracks in cylinder and cylinder covers may （） from unequal heating.

  A . make B . cause C . result D . produce

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• Each cylinder has one starting valve which is usually opened by air pressure and closed by （）

  A . nuts and bolts B . new joints C . spring force D . sealing ring

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• When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）

  A . intake stroke B . compression stroke C . power stroke D . exhaust stroke

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• Because the timing of injection is crucial, （） mounted on the camshaft, which is driven by the crankshaft are used to operate the fuel pumps, one of which is provided for each cylinder.

  A . gears B . rams C . barrels D . cam

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• The cooling water jacket is common to all the cylinders but there are often （） to ensure that each cylinder receives the right amount and flow of water.

  A . dividing walls B . divided walls C . dividing liners D . divided jacket

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• The engine in a covered lifeboat is fueled with（）.

  A . kerosene B . unleaded gasoline C . diesel oil D . liquefied ga

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• In each cylinder cover there are two or three holes for （）

  A . the exhaust valves B . the fuel valves C . indicator cocks D . the fuel pum

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• The cylinder covers are secured by eight elastic holding down arranged in four pairs（）

  A . nuts B . screws C . studs D . flange

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• In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.

  A . by an fuel valve B . through an inlet valve C . with an exhaust valve D . from an outlet valve

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• In the body paragraph, _______ is used to tell the reader what each paragraph will cover.

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• Multiple Choice （20 points each，100 points in total.) 3. A cover letter has all but which of the following purposes？

  A、A. Securing a job offer. B、B. Introducing the resume. C、C. Highlighting the sender's strengths. D、D. Gaining an interview.

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• The lighting in Jake’s Steak Restaurant is dim. The chairs are covered in leather and each table is covered with a white linen cloth. The colors are limited to earth tones with an occasional splash of

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