【单选题】
磁盘碎片整理程序的主要作用是___。（易）（基础知识）
A. 延长磁盘的使用寿命
B. 使磁盘中的坏区可以重新使用
C. 使磁盘可以获得双倍的存储空间
D. 使磁盘中的文件成连续的状态，提高系统的性能
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关于信息处理的论述正确的是___。 （中（基础知识）
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保证网络安全是使网络得到正常运行的保障，以下说法错误的是___(中)。（消防通信网络与业务系统管理）
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通信设备用交流电供电时，在通信设备的电源输人端子处测量的电压允许变动范围为额定电压值的___。（易）（基础知识）
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