误差的大小和方向______的误差称为变值系统误差。
参考答案：按一定的规律变化
党的思想路线
The put-call parity relation can be adjusted for dividend payments on a stock by which of the following methods（）
A. Add the present value of the expected dividend payments to the current stock price.
B. Subtract the present value of the expected dividend payments from the exercise price.
C. Subtract the present value of the expected dividend payments from the current stock price.
