[单选题] Spark timing is so critical to an engine’s performance that most modern cars use a sensor to tell the engine control unit(ECU) __ .
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1、[单选题]What are the two main types of steering systems that cars use?

• A、Recirculating-ball and power-assiste
• B、Rack-and-pinion and power-assiste
• C、Power-assisted and active steering.
• D、 Recirculating-ball and rack-and-pinion.

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2、[单选题]The three process involved in the ABS working process are as follows: __

• A、Pressure increases cycle, pressure maintains cycle, pressure reduces cycle.
• B、Pressure maintains cycle, pressure increases cycle, pressure reduces cycle.
• C、C. Pressure reduces cycle, pressure maintains cycle, pressure increases cycle.
• D、 Pressure maintains cycle, pressure reduces cycle, pressure increases cycle.

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3、[单选题]What is the most common problem associated with clutches?

• A、The friction material on the disk makes a whining noise.
• B、The friction material on the disk wears out.
• C、 The friction material on the disk lasts too long.

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4、[主观题]【翻译】连杆小头与活塞销连接，连接处有像青铜这样软金属制成的衬套，连杆下端连接在曲柄轴径上，称为连杆大头。

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5、[主观题]【翻译】The cam is an egg-shaped piece of metal on a shaft that rotates in coordination with the crankshaft. The metal shaft, called the camshaft, typically has individual cams for each valve in the engine.

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