题目内容

按照10BASE-2标准,一个网段的最大段长为(1),网段之间采用中继器最多可以连接(2)个网段。 空白(1)处应选择()

A. 100m
B. 185m
C. 200m
D. 500m

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在同步数字系列(SDH)标准中,STM-64的数据速率为()。

A. 622Mbps
B. 1.5Gbps
C. 10Gbps
D. 100Gbps

以下关于曼彻斯特编码的描述中,错误的是()。

A. 无须另外传输同步信号
B. 每个比特都由两个码元组成
C. 用电平跳变来区分0和1
D. 用电平的高低来区分0和1

SpyWare and other fonns of malware afe the biggest online threat to your computer's (1) nowadays. There malicious (2) which get to your PC through freeware, shareware, commercial sites, deceptive pop-ups or in any other way, can record your surfing habits and sites you visit, share your personal information with their partners. Any personal (3), when in wrong hands, can leave you a victim of an"identity theft"by steeling your credit (4) details, birth records and other (5) information. 空白(2)处应选择()

A. hardware
B. cards
C. programs
D. equipment

与八进制数1706等值的十六进制数是()。

A. 3C6
B. 8C6
C. F18
D. FIC

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