把一个力分解为方向已知（）的两个分力，这种分解称为正交分解，所得的两个分力称为正交分力。
参考答案：互相垂直
I fell in lovewith her ____ I met her at a birthday party. [ ]
A. for the first time
B. the first time
C. by the first time
D. first time
实验电影
