[单选题] After the fuel system delivers air-fuel mixture to a cylinder,a(an)______ ignites the mixture.

1、[主观题]【中译英】转向螺杆不直接接触转向螺母的螺纹，其间装有很多钢球。

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2、[主观题]【英译中】The engine which is called the "heart" of a vehicle is used to supply power for an automobile. It includes the fuel, lubricating, cooling, ignition and starting systems. Generally, an automobile is operated by internal combustion engine. The internal combustion engine burns fuel within the cylinders and converts the expanding force of the combustion or "explosion" into rotary force used to propel the vehicle.

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3、[主观题]【英译中】Recirculating ball steering gear consists of two parts: a worm on the end of the steering shaft and a pitman arm shaft on which there is a gear sector.

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4、[主观题]【英译中】The auto description above seems to conclude that though automobiles are quite different in design, they are basically similar in structure.

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5、[主观题]【英译中】Text Four-stage-engine Operation

There are various types of engines such as electric motors, steam engines and internal combustion engines. But, the internal combustion engine seems to be the one most commonly used in the automotive field. According to the fuel energy used, internal combustion engines are further divided into gasoline engines, kerosene engines, diesel engines, etc.

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