Question

gasoline and diesel engines are both internal combustion engines, which create energy by burning fuel inside a combustion chamber. a diesel engine uses a four - step process, called a four - stroke combustion cycle, in the same way that a gasoline engine does. one difference between the two types of engines is the ignition process. in a gasoline engine, fuel and air are mixed and ignited by a spark plug. but in a diesel engine, instead of using spark ignition, the engine injects fuel directly into a combustion chamber. the heat of the compressed air lights the fuel. another difference between the two engines is the efficiency. diesel engines are more efficient and powerful, so they are often used in very large vehicles. by contrast, gasoline engines are less efficient and create less power, but their fuel is usually cheaper.

Explanation:

The text states that gasoline and diesel engines are both internal combustion engines and use a four - stroke combustion cycle. For spark plugs, it's mentioned that gasoline engines use spark plugs for ignition. For direct fuel injection, the text says diesel engines inject fuel directly into the combustion chamber.

Answer:

Diesel engines: Are internal combustion engines (✓), Use a four - stroke combustion cycle (✓), Use direct fuel injection (✓)
Gasoline engines: Are internal combustion engines (✓), Use a four - stroke combustion cycle (✓), Use spark plugs (✓)