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【单选题】
下列关于协方差和相关系数的说法中,不正确的是( )。A.
如果协方差小于0，则相关系数一定小于0
B.
如果相关系数为0，则表示不相关，也不能分散风险
C.
证券与其自身的协方差就是其方差
D.
相关系数为－1时，风险分散效应最大
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举一反三
【单选题】Mineral deficiencies can often be detected by specific symptoms such as chlorosis(loss of chlorophyll resulting in yellow or white leaf tissue), necrosis(isolated dead patches), anthocyanin formation(...
A.
fight off
B.
show
C.
cause
D.
spread
【简答题】vi. think that sb. or their behavior, ideas, etc. are bad or wrong 不赞同;反对
【简答题】There’s a big difference between the amount required to pr deficiencies that would lead to serious degeneration, and the amount of each vitamin and mineral you need for optimum health
【简答题】mineral nutrition
【简答题】vt. officially accept a plan, proposal, etc. 批准;认可vi. think that sb. or sth. is good, right, or suitable 赞许;赞成;同意
【单选题】Which is not the cause of mineral form?
A.
chemical composition
B.
crystal structure
C.
crystallization environment
D.
colour of mineral
【单选题】Severe vitamin and mineral deficiencies can lead to mental ___________.
A.
chaos
B.
disorders
C.
confusion
D.
mix
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