预测在能源系统中大致可以分为哪几种？
参考答案：
预测在能源系统中大致可以分为能源需求预测、能源供应预测、能源新技术发展预测和世界能源宏观发展预测四种。
角化囊肿（）
A.牙冠或牙根形成之后
B.埋伏牙
C.根尖周肉芽肿
D.牙板残余
E.成釉器发育的早期
An analyst does research about the put-call parity. With respect to the put-call parity, which of the following positions is equal to a synthetic call position（）
A. Long a put, long the underlying, and short a risk-free bond.
B. Short a put, long the underlying, and short a risk-free bond.
C. Long a put, short the underlying, and long a risk-free bond.
