A:珍珠蚌、鲫鱼、鳄鱼
B:河蚌、青鱼、海马
C:鲸、蛇、乌龟
D:青蛙、青鱼、蝌蚪
—I didn't push her ; it was an accident.
在等腰直角△ABC中,∠C=90°,AC=8,D为AC上一点,若 tan∠DBC=14 ,则AD=____