【简答题】Next, they where to cut or bore into the workpiece ,how fast to feed the metal into the machine, and how much metal to remove. Theythen tools and materials for the joband plan the sequence of cutting ...
【单选题】In today’s practice, with cylinders of equal diameter of bore and equal revolutions, the two-cycle engine delivers a power about 80 percent ____ than that of the four-stroke one.