[单选题] A latch mechanism is inserted into the slot in the output shaft in the manual transmission, so as to lock the drive wheels and keep them from turning, thereby preventing the vehicle from rolling. Which gear does the statement indicate?

1、[单选题]A manual transmission is connected to the engine through the __ .

• A、differential
• B、belt
• C、 clutch

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2、[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

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3、[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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4、[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。

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5、[主观题]【翻译】润滑系的机油泵从油底壳抽出机油 并把机油输送给发动机的所有工作部件。机油从油底壳流进流出.因而在油底壳和发动机的工作部件之间就有机油定向循环流动。

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