上题中，关于股票组合的总风险说法正确的是（）。 ["总风险在变大","总风险不变","总风险在全面降低，当N大于30时，总风险略微大于市场风险","总风险的变化方向不确定"]
伯利克里曾在演说中这样说道：“任何人（雅典公民），只要他能够对国家有所贡献，绝对不会因为贫穷而在政治上湮没无闻。”为此他采取的改革措施是（）。 ["废除债务奴隶制","财产等级制","津贴制","比例代表制"]
A network administrator must configure 200 switch ports to accept traffic from only the currently attached host devices. What would be the most efficient way to configure MAC-level security on all these ports?（） [" Visually verify the MAC addresses and then telnet to the switches to enter the switchport-port security mac-address command."," Have end users e-mail their MAC addresses. Telnet to the switch to enter the switchport-port security mac-address command."," Use the switchport port-security MAC address sticky command on all the switch ports that have end devices connected to them."," Use show mac-address-table to determine the addresses that are associated with each port and then enter the commands on each switch for MAC address port-security."]
一种1年期满时偿付1000元人民币面值的中国国库券，如果年初买入的价格为900元人民币，计算其到期收益率i是多少？（计算结果保留%内一位小数）
国防建设现代化的主要内容
中国资本主义何时萌芽？
