下列哪些说法是错误的?()

【名词&注释】

项目经理(project manager)、标准差(standard deviation)、工作时间(working time)、可维护性(maintainability)、预防性维护(preventive maintenance)、计算机硬件(computer hardware)、进一步(further)、脆弱性分析(vulnerability analysis)、脆弱性扫描(vulnerability scan)

[单选题]下列哪些说法是错误的?()

A. 脆弱性分析^{(vulnerability analysis)}系统仅仅是一种工具
B. 脆弱性扫描^{(vulnerability scan)}主要是基于特征的
C. 脆弱性分析^{(vulnerability analysis)}系统本身的安全也是安全管理的任务之一
D. 脆弱性扫描^{(vulnerability scan)}能支持异常分析

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举一反三：

[单选题]● 项目经理对某软件需求分析活动历时估算的结果是：该活动用时2周（假定每周工作时间是5天）。随后对其进行后备分析，确定的增加时间是2天。以下针对该项目后备分析结果的叙述中，（36）是不正确的。（36）

A. 增加软件需求分析的应急时间是2天
B. 增加软件需求分析的缓冲时间是该活动历时的20%
C. 增加软件需求分析的时间储备是20%
D. 增加软件需求分析的历时标准差是2天

[单选题]因计算机硬件和软件环境的变化而作出的修改软件的过程称为(52)。

A. 校正性维护
B. 适应性维护
C. 完善性维护
D. 预防性维护

[多选题]● Personal firewall is a technology that helps __(66)__ intruders from accessing data on your PC via the Internet or another network, by keeping __(67)__ data from entering or exiting your system.Hackers do not just target national security organizations for __(68)__: They want your tax returns, network passwords, or bank account numbers. And you do not want the FBI kicking in your door because someone hijacked your PC to __(69)__ in the latest denial-of-service attack on the Internet. Now that “always-on” broadband connections such as cable modems and digital subscriber line are becoming more popular, home users are at risk. Fortunately, you can protect your data.

A. Firewalls can block __(70)__ attacks and protect your PC from outside threats.
B. (66)
C. allow
D. prevent
E. invite
F. get
G. (67)
H. authorized
I. refused
J. denied
K. unauthorized
L. (68)
M. attacks
N. aggression
O. help
P. repair
Q. (69)
R. enlist
S. go to
T. participate
U. attach
V. (70)
W. malicious
X. friendly
Y. neighborly
Z. goodwill

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