题目内容

In the first stroke, both intake and exhaust valves are opened.

A. 对
B. 错

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In the exhaust stroke, the piston moves downwards to push the burned gases out of the cylinder.

A. 对
B. 错

A spark plug is used to ignite the fuel-air mixture in the gasoline engine.

A. 对
B. 错

A cylinder head is a casting only made from iron.

A. 对
B. 错

In general, the valves are held in the cylinder head instead of the cylinder block.

A. 对
B. 错

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