The author of the article was, no doubt ______.
A. a linguist
B. an essayist
C. a scientist
D. an attorney
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下面关于“三网”的叙述中，正确的是( )。
A. 有线电视网(CATV)采用数字传输方式，是一种数字网络
B. 有线电视网采用树形拓扑结构
C. 电信网是3种网络中宽带化程度最高的
D. 计算机网是公用网，连接范围最大，服务范围最广
The main purpose of this passage is to ______.
A. prove that different people have different definitions of culture
B. inform that variations exist as far as a culture is concerned
C. indicate that culture is closely connected with social classes
D. show that the idea that the poor constitute a separate culture is an absurdity
java.nio包的新特点是内存映射技术、字符及编码、非阻塞I/O和下列哪一项 ( )
A. 文件锁定
B. 文件共享
C. 文件保护
D. 文件散列
( )处于智能大楼的核心地位。
A. 计算机网络系统
B. 程控交换机
C. 传感器
D. 结构化布线系统
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