The piston moves up and down， thus causing the rotational movement of the（）
举一反三
- 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．
- In tropical, subtropical and warm temperate humid climate zones, water and salt movement is dominated by ( ). A: upward movement B: downward movement C: up and down movement alternately D: vertical
- ____: n. the rate at which a sound wave, light wave, or radio wave moves up and down 震动频率
- The energy for pushing this piston up can be supplied from （）， so that the piston can keep moving up and down.
- Don't sit _____. Stand _____, please. A: up, down B: down, up C: down, down D: up, up