题目内容
● 某综合办公大楼的楼高20层，其综合布线系统一般采用的拓扑结构是（21）。
（21）A．环型 B．总线型 C．分级星型 D．星环型
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某一烃类化合物质谱的分子离子峰m/z=102，其1HNMR谱在δ=7.4(单峰，5H)和3.1(单峰，1H)，IR吸收峰在2210cm-1和3310cm-1，试推导该化合物的结构。
● Computers will become more advanced and they will also become easier to use．Improved speed recognition will make the operation of a computer easier．Mrtual reality（虚拟现实），the technology of（71）with a computer using all of the human senses, will also contribute to better human and computer（72）．Other, exotic（奇异的）models of computation are being developed, including biological computing that uses living organisms, molecular computing that uses molecules with particular （73），and computing that uses DNA, the basic unit of heredity（遗传）to store data and carry out operations． These are examples of possible future computational platforms that, so far, are limited in abilities or are strictly（74）．Scientists investigate them because of the physical limitations of miniaturizing circuits embedded in silicon．There are also （75） related to heat generated by even the tiniest of transistors． （71）A.interact B.interacting C.communicate D.using （72）A.interfaces B.behavior C.similarities D.comparison （73）A.software B.properties C.programs D.hardware （74）A.empirical B.real C.practical D.theoretical （75）A.developments B.advantages C.limitations D.improvements
● 在《软件文档管理指南GB/T16680-1996》中，对确定文档的质量等级作了规定，软件文档的质量可以按照文档的形式和列出的要求划分为四个等级。对于由同一单位内若干人联合开发的程序，或要交由其他单位使用的程序，应该达到（12）级的要求。
（12）A．一 B．二 C．三 D．四
下列关于灾难备份中心的选址原则的叙述，错误的是（65）。
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