题目内容
In the exhaust stroke, the piston moves downwards to push the burned gases out of the cylinder.
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A spark plug is used to ignite the fuel-air mixture in the gasoline engine.
A cylinder head is a casting only made from iron.
In general, the valves are held in the cylinder head instead of the cylinder block.
In the first stroke, the exhaust valves are opened, letting the fuel-air mixture into the combustion chamber.
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