如果投资者预测股市将大幅下调，投资组合B系数将变大，则可根据β系数变化的幅度，对套期保值期货合约数量进行相应调整。( )
参考答案：对
Excuse me , can you tell me ?
A．when does the plane leave
B．how long the plane has left
C．when the plane leaves
D．when did the plane leave
甲骨文已有多少年历史？说明汉字历史意义是什么？
