对刚体而言，力偶矩矢是一个（）。
A．定位矢量
B．自由矢量
C．滑动矢量
D．旋转矢量
参考答案：B
车辆定距
At the time a forward contract is initiated, which of the following is/are agreed upon by the two parties()
A. The good to be exchanged and the price at which the exchange will be made.
B. The time at which the exchange will take place.
C. All of above are agreed upon.
