TAD现象
参考答案:
小麦或大麦长期连作,全蚀病达到高峰后,病害就有逐渐自然减退的观象。此现象称为“全蚀病的自然衰退(take-all decline,简称TAD.
Even the white collars in big cities know that, high as their income is, they still can't afford a new house _____. [ ]
A. physically
B. personally
C. economically
D. accidentally
投资或者购买与管理基础资产收益波动负相关或完全负相关的某种资产或金融衍生品的风险管理策略是( )。
A.风险规避B.风险对冲C.风险分散D.风险转移