短语词组短語virtual steepness 虛陡度gradient steepness 梯度傾斜度slope steepness 邊坡陡度;地形坡度steepness ratio 陡度比率characteristic steepness 特征波陡lightning steepness 雷電流陡度generalized steepness 廣義陡度nominal steepness 標稱陡度steepness method 陡度法 返回 steepness