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网关的作用是将网内的主机发送的数据转发到网外
答案：
正确
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问答题
When arbitrage is absent from financial markets, and investors are each concerned with only the risk and return to their portfolios, then each investor can eliminate all the riskiness of his investments through diversification, and as a consequence the expected yield on each available asset will depend only on the covariance of its yield with the covariance of the yield on the diversified portfolio of risky assets each investor holds.
When arbitrage is absent from financial markets, and investors are each concerned with only the risk and return to their portfolios, then each investor can eliminate all the riskiness of his investments through diversification, and as a consequence the expected yield on each available asset will depend only on the covariance of its yield with the covariance of the yield on the diversified portfolio of risky assets each investor holds.
答案：
这个陈述是不正确的。在没有套利机会的金融市场中，投资者确实关注他们投资组合的风险和回报。然而，即使通过多样化投资组合，投...
