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3. Answer the questions:

1. What are the operations in the four-stroke cycle?

2. What can you say about gasoline engine?

3.Discribe the internal combustion engine.

4. A camshaft which is used to open and close the valves, isn’t it?

5. Why is such a type of engine called the internal combustion engine?

6. What energy does the internal combustion engine convert?

7. How many valves are there in the internal combustion engine? What are they?