[主观题] 【翻译】The engine block serves as a rigid metal foundation for all parts of an engine. It
contains the cylinders and supports the crankshaft and camshaft. In older engines, the
valve seats, ports, and guides are built into the block. Accessory units and the clutch
housing are bolted to it. Blocks are made of either cast iron or aluminum. The lighter

1、[单选题]The __ converts the rotation motion of the steering wheel into the straight-line motion.

• A、drag link
• B、tie rod
• C、 Steering knuckle
• D、 Steering gear

• 点击查看答案
• 进入题库做题

2、[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.

• 点击查看答案
• 进入题库做题

3、[主观题]【翻译】As the camshaft rotates, the lobe, or high spot of the cam, pushes against parts connected to the stem of the valve. This action forces the valve to move downward. This action could open an inlet valve for an intake stroke, or open an exhaust valve for an exhaust stroke.

• 点击查看答案
• 进入题库做题

4、[主观题]【翻译】柴油机发动机根据喷油方法不同，活塞头部可以形成全部燃烧室，也可以是燃烧室的一部分．

• 点击查看答案
• 进入题库做题

5、[主观题]【翻译】大多数活塞由铝铸造而成。通过连杆的作用，活塞把可燃混合气燃烧产生的力传递给曲轴，带动 曲轴旋转。

• 点击查看答案
• 进入题库做题