短語詞組短語mechanical l advantage 機械利益actual mechanical advantage 實際機械利益MECHANICAL ADVANTAGE OF LEVER 杠桿機械傚益westbank mechanical advantage 機械利益ideal l mechanical advantage 理想機械利益pitch mechanical advantage switch 頫仰操縱傳動比變換器電門ideal mechanical advantage 理想機械利益mechanical advantage shifter 機械傚益調(diào)節(jié)器mechanical advantage ratio 傳動比 返回 mechanical advantage