99色精品-9色在线-99色在线-99色视频 国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

單項(xiàng)選擇題

Which of the engine components listed increases air charge density and helps to improve engine operating efficiency?()

A.Intake manifold
B.Water-cooled exhaust system
C.After-cooler
D.Exhaust diffuser

微信掃碼免費(fèi)搜題