风温是感受______所引起的急性外感热病。多发生于______两季。
参考答案：风热病邪 冬春
An analyst does research about option value. Prior to expiration, the maximum value of an American call is the:（）
A. excise price.
B. current price of the underlying.
C. present value of the exercise price.
对于容易产生静电的场所，应保持环境湿度在70%以上。
