正确答案: A

磁盘碎片整理

题目：在Windows XP中，为提高计算机访问硬盘的速度，可定期进行（ ）。

解析：A

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学习资料的答案和解析：

[单选题]●在PowerPoint 2000中，不能对个别幻灯片内容编辑修改的视图方式是 (24) 。(24)

幻灯片浏览视图

解析：【解析】PowerPoint 2000提供了5种视图方式：幻灯片视图、大纲视图、幻灯片浏览视图、备注视图以及幻灯片放映视图。其中幻灯片浏览视图用来对幻灯片重新排列顺序、设置放映方式、换页方式以及切换声音和幻灯片播放时的动画效果等，但不能对个别幻灯片内容进行编辑修改。其他4种视图方式均可对幻灯片的内容进行复制、插入、移动和删除等编辑操作。

[单选题]The usual way to ensure reliable delivery is to provide the (71) with some feedback about what is happening at the other end of the line. Typically, the protocol calls for the receiver to send back special (72) flame bearing positive or negative (73) about the incoming frames. If the sender receives a positive acknowledgement about a frame, it knows the frame. has arrived safely. On the other hand, a negative acknowledgement means that' something has gone wrong, and the frame. must be transmitted again.An additional complication comes from the possibility that hardware troubles may cause a flame to (74) completely. In this case, the receiver will not react at all, since it has no any reason to react. It should be clear that a protocol in which the sender transmits a frame. and then waits for an acknowledgement, positive or negative, will hang forever if a frame. is ever lost due to, for example, (75) hardware.

sender

[单选题]以下选项中，不常见的内存容量是(1)。

1.5GB

解析：解析：通常，一条内存的容量数字是2的指数，例如128MB、256MB、512MB、1GB、 2GB等。

[单选题]下列选项中，(57)不属于网络管理的目标。

鼓励用户上网、推动软件技术进步

解析：解析：鼓励用户上网、推动软件技术进步不属于网络．管理的目标。

[单选题]In C language，the increment and decrement operator can only be applied to(56)，so an expression like x＝(a+b)--is illegal.

variables

解析：解析：c语言中，自增和自减操作符，只能适用于变量，所以一个类似x＝(a+b)--的表达式是非法的。