短語詞組短語piston down stroke 活塞曏下行程return piston stroke 活塞廻程forward impedance piston stroke 活塞進程forward piston stroke 活塞進程pump piston stroke 泵柱塞沖程Setting piston stroke 設(shè)定活塞行程length og drawing piston stroke 主缸行程Length of drawing piston stroke 主缸行程opposed -piston two-stroke 對置活塞二沖程 返回 piston stroke