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右图是日本本田公司在V 形四缸NR750型竞赛摩托车上使用的活塞。使用这种活塞时,每个气缸有八个气门。目的是增加进气量。
The picture on the right shows the piston used by Japan Honda in a V-shaped four-cylinder NR750 racing motorcycle. With this type of piston, there are eight valves per cylinder. The purpose is to increase the amount of intake air.