今天,似乎所有的汽车制造商试图不断的流行一个竞争,宣布一个新的传输更多的齿轮或“速度”。(Popular Mechanics did a nice article about why you would want more gears.) Basically, transmission designers want to keep the engine operating at or near its peak operating efficiency point and extend the operating ran...
»阅读更多
