The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.
举一反三
- At bottom dead center, the centerline of the connecting rod usually coincides with the（） A: angularity of the piston motion B: inertia moment from the piston C: centerline of the cylinder D: centerline of the king pi
- At the bottom dead center (BDC), the piston moves back up, compressing the trapped fuel-air mixture in the cylinder with both intake and exhaust valves closed．
- The compressed air is admitted to each cylinder through a cam operated by starting air valve when the piston has just passed its （）.
- The two-stroke cycle begins with the piston coming up from the bottom of its stroke， with scavenge ports in the sides of the cylinder being （）.
- Piston cooling fins are located ______. A: at top the piston crown B: beneath the piston crown C: at the base of the piston skirt D: inside the cylinder liner<br/>cooling water jacket