正确答案: B
File Access
题目:ActiveX组件中______组件提供可用于在计算机文件系统中检索和修改文件。
解析:B
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[单选题]Prior to the availability of enterprise EDM, locating a document over a LAN could be difficult, and over a WAN(66)nearly impossible. With the model for collaborative work spreading, and with more users sharing(67)documents through e-mail and the Internet, enterprise EDM had become a necessity.Many businesses are finding their greatest competitive advantage is the ability to harness the document(68)lifecycle. EDM systems manage this lifecycle from creation, revision, storage and(69)retrieval to routing and workflow. They also allow users to work on documents collaboratively.
nearly
[单选题]计算机网络通信中传输的信号是(29)。
既可以是模拟信号也可以是数字信号
解析:解析:计算机网络是数据通信系统。计算机本身具有的数据是数字数据,通信过程中传输的是信号。数字数据既可以是模似信号也可以是数字信号。
[单选题]在数据传输中,误码率反映了系统正常工作状态下的(18)。
可靠性
解析:解析:误码率(BER)是衡量数据在规定时间内数据传输精确性的指标。误码率=传输中的误码/所传输的总码数×100%。误码的产生是由于在信号传输中,衰变改变了信号的电压,致使信号在传输中遭到破坏,产生误码。噪音、交流电或闪电造成的脉冲、传输设备故障及其他因素都会导致误码(比如传送的信号是1,而接收到的是0;反之亦然)。因此,误码率是最常用的数据通信传输质量指标,即可靠性。