单项选择题

FDDI的基本编码方法是(26)。在此基础上采用(27)，编码以获得足够的同步信息，这样使编码效率提高到(28)。IEEE 802.3所采用的编码方式是(29)，编码效率是(30)。

A．曼彻斯特编码
B．差分曼彻斯特编码
C．NRZ
D．NRZI
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单项选择题
The approach we propose is a system-oriented methodology for knowledge acquisition. This orientation emphasizes ongoing documentation throughout each cycle and technique applied. Program-wide documentation is suggested, both for the purpose of internal(71)and for later verification and(72)efforts: The documentation system we propose includes a central 'knowledge acquisition(73)'which is(74)to reflect knowledge acquisition plans, session nodes, and domain expert participation. Specifically,(75)within the database system include knowledge acquisition forms, which document plans for, and notes from, knowledge acquisition session, domain expert file, and rule content forms.
A．interchange
B．interface
C．communication
D．message
单项选择题
在Windwos操作系统缺省状态下，下列关于文件复制的描述不正确的是(5)；当选定文件或文件夹后，不将文件或文件夹放到“回收站”中，而直接删除的操作是(6)。
A.利用鼠标左键拖动可实现文件复制
B．利用鼠标右键拖动不能实现文件复制
C．利用剪贴板可实现文件复制
D．利用组合键Ctrl+C和Ctrl+V可实现文件复制
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