在框架结构中，设计规范对框架梁中线与柱中线两者间的关系作了规定，下列叙述中哪项是正确的？（）
A. 不宜重合
B. 必须重合
C. 偏心距不宜过小
D. 偏心距不宜过大
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功能评价的基本问题就是功能的质量值化。
A. 正确
B. 错误
下列不属于网上银行特点的是（）
A. 虚拟化的金融服务机构
B. 不受时间和空间的约束
C. 和传统银行相比有着同样的业务范围，但提供了便利
D. 提高了管理水平
Which two network attack statements are true？（）
Access attacks can consist of password attacks，trust exploitation，port redirection，and man-in-the-middle attacks.
B. Access attacks can consist of UDP and TCP SYN flooding，ICMP echo-request floods，and ICMP directed broadcasts.
C. 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.
E. IP spoofing can be reduced through the use of policy-based routing.
F. 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.
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