题目内容
EMH suggests that no investor has an advantage in predicting a return on a stock price since no one has access to information not already available to everyone else.
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The greater the positive correlation coefficients, the lower the risk in a large portfolio.
Covariance and correlation measure how two random variables are related.
The risk of an asset is judged by the risk of its return.
指教师有意识地让幼儿多次使用同一个言语因素（如：语音、词汇、句子等）或训练幼儿某方面的言语技、技巧而经常使用的一种方法是属于幼儿语言教育的哪种方法？
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