2015 Shanghai Question 3 Free-response Differentiating 2015_上海 Paper 3.如图,鸟沿虚线斜向上加速飞行,空气对其作用力可能是A $F _ { 1 }$ B $F _ { 2 }$ C $F _ { 3 }$ D $F _ { 4 }$ Answer keyB ☆ SaveCan't do it, show the explanation查看原卷 →