短語詞組短語area displacement ratio 面積置換率the area constriction ratio 面積收縮比area moment ratio 相對(duì)靜面積矩nozzle area expansion ratio 噴管擴(kuò)張比area -ratio matrix 面積比矩陣area balance ratio 面積平衡比area contraction ratio 面積縮窄率contact area holding ratio 接地面積保持率area illumination ratio 區(qū)域照度比 返回 area ratio