In the first stroke, the exhaust valves are opened, letting the fuel-air mixture into the combustion chamber.
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The camshaft is used to open and close the valves with the motion of the pistons.
A. 对
B. 错
DOHC means that there are two camshafts in the cylinder block.
A. 对
B. 错
Cylinder block or engine block is actually a complex machined casting unit.
A. 对
B. 错
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