从亲和沉淀的机理和分离操作的角度出发，简述亲和沉淀纯化技术的优点。
Which two network attack statements are true？（） Access attacks can consist of password attacks，trust exploitation，port redirection，and man-in-the-middle attacks.。 Access attacks can consist of UDP and TCP SYN flooding，ICMP echo-request floods，and ICMP directed broadcasts.。 DoS attacks can be reduced through the use of access control configuration，encryption，and RFC 2827 filtering.。 DoS attacks can consist of IP spoofing and DDoS attacks.。 IP spoofing can be reduced through the use of policy-based routing.。 IP spoofing exploits known vulnerabilities in authentication services， FTP services，and web services to gain entry to web accounts，confidential databases，and other sensitive information.。
购买力风险是由于通货膨胀而使投资者收到本息的购买力上升的风险。（）
填隙物
Which two privileged mode cisco ios commands can be used to determine a cisco router chassis serial number?（） show inventory。 show flash：filesys。 dirflash：include chassis。 show diag。 show controller。
如果用户所安装的 TCP/IP 网络与其他网络或 Internet 相连，则必须（）
