The total quantity of water on Earth______
A. remains almost unchanged.
B. has greatly increased in recent years.
C. is decreasing constantly.
D. is affected by global warming.
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假设A证券的标准离差是12%,B证券的标准离差是20%,AB证券之间的预期相关系数为0.2,在资产组合中A证券占的比例为70%,B证券占的比例为30%,则AB资产组合收益率的标准离差为11.26%。()
A. 正确
B. 错误
基金获准上市的,应在上市日前一周内,将基金份额上市交易公告书登载在指定报刊和管理人网站上。()
A. 正确
B. 错误
可赎回债券的利息收入具有较大的不确定性。()
A. 正确
B. 错误
The title "Light Night, Dark Stars" means______
A. the night sky is brightly lit up and stars are black.
B. lights appear at night and stars are seen in the dark.
C. city lights at night illuminate stars in the sky.
D. city lights illuminate the night sky, making stars invisible.