问答题

思科路由器的内存体系由多种存储设备组成，其中用来存放IOS引导程序的是（11），运行时活动配置文件存放在（12）中。

A.FLASH
B.ROM
C.NVRAM
D.DRAM

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结构化布线系统分为六个子系统，其中水平子系统的作用是（67），园区子系统的作用是（68）。

A.连接各个建筑物中的通信系统
B.连接干线子系统和用户工作区
C.实现中央主配线架与各种不同设备之间的连接
D.实现各楼层设备间子系统之间的互连

CDMA for cellular system can be described as follows. As with FDMA, each cell is allocated a frequency （71） , when is split into two parts, half for reverse (mobile unit to base station) and half for （72） (base station to mobile unit). For full-duplex （73） , a mobile unit both reverse and forward channels. Transmission is in the form. of direct-sequence spread （74） , which used a chipping code to increase the data rate of the transmission, resulting is an increased signal bandwidth. Multiple access is provided by assigning （75） chipping codes to multiple users, so that the receiver can recover the transmission of an individual unit from multiple transmissions.

A.ware
B.signal
B.bandwidth
D.domain