The burning of the fuel adds more heat to the air charge, causing it to expand and force the engine piston to do work on the crankshaftWhat does “it” mean in this sentence?（）

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• The burning of fuel oil in a diesel engine having a high sodium content, will cause （）

  A . corrosion and grooving of exhaust valves B . corrosion and gumming of the fuel injection pump C . salt deposits in the exhaust manifold D . slag deposits in the fuel injection equipment

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• When the fuel oil is burning in the combustion chamber, it （）.

  A . gives up large amount of heat B . gives off large amount of heat C . gives up large amount of steam D . gives off large amount of steam

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• The cetane rating of diesel fuel is an indication of the（）

  A . ignition quality of the fuel B . calorific value of the fuel C . flash point of the fuel D . rate of fuel consumptio

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• The fire of burning plastics is classified as （） fire.

  A . Class A B . Class B C . Class C D . Class D

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• The fire of burning paper is classified as（）fire.

  A . Class A B . Class B C . Class C D . Class D

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• The rate of expansion of heated fuel oil varies with the （）.

  A . conductivity B . viscosity C . volume D . specific gravity

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• The higher the cetane number, （） the ignition quality of the fuel.

  A . the worse B . the better C . the smaller D . the greater

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• Diesel fuel is relatively safe to handle due to its low volatility, but the fumes will self-ignite and continue to burn steadily if the fuel is heated to the （）.

  A . flash point B . auto-ignition point C . volatility point D . upper explosive limit

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• The selection of an oil depends （） on the operating conditions, the design of the engine and the type of fuel to be burned.

  A . to a great extent B . on a great extent C . on mainly D . on only

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• If fuel is burned from only the starboard tanks, the ship will （）.

  A . go down by the head B . list to starboard C . trim by the stem D . list to port

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• Air in the fuel lines to the fuel injection nozzles of a diesel will result in （）.

  A . lower compression pressures B . overheating without smoking C . failure to start D . a run away without load

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• The cylinder contains a great weight of air and is capable of burning a great quantity of fuel at（）.

  A . the beginning of the compression stroke B . the beginning of the suction stroke C . the end of the working stroke D . the end of the exhaust stroke

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• The consistent burning of fuel oil with a high sulfur content in a diesel engine will result in （）

  A . clogged fuel injection pumps B . increased cylinder liner wear C . intake valve stem corrosion D . varnish deposit on pisto

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• A diesel engine burns （） a gasoline engine of the same capacity in the same period of time.

  A . as much fuel as B . less fuel than C . less fuel as D . more fuel tha

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• Which of the following represents the significance the fuel oil cetane number?（）

  A . The cetane number has no affect on injection lag B . The cetane number is an indication of the fuel’s viscosity C . Ignition lag is reduced with fuels having a high cetane number D . The cetane number is of little significance in the combustio

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• There is a growing realization that the only effective way to achieve further reductions in vehicle（）is to replace conventional diesel fuel and gasoline with cleaner-burning fuels.

  A . permission B . emission C . omission D . Missio

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• From the detail of burning throat, we can actually see the narrator feels () at that moment.

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• In the ancient festival of Saturnalia ______ used to burn the effigy of the king of ancient Saturnalia.

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• Robert Burns is the national poet of ：

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• Robert Burns is the best known of the poets who have written in the ( ) dialect.

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• Which of the following is Not true about Robert Burns?

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• Robert Burns is the best known of the poets who have written in the ( ) dialect.

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• Which of the following is true of the other factors fueling the bankruptcy rise？

  A．Lack of medical insurance has brought about social troubles. B．Unemployment has impaired cardholders" ability to repay debts. C．The growth of gambling industry has inhibited money wasting. D．Government authorities have decided to legalize bankruptcy.

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• Most cities in the country have introduced “Clean Air Zones”（) factories and households are only allowed to burn smokeless fuel.

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