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【单选题】
目前常用的保护计算机网络安全的技术性措施是使用( )A.
防火墙
B.
防风墙
C.
KV300 杀毒软件
D.
使用 Java 程序
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
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【单选题】The secrets of sleep were a mystery for centuries simply because there was neither the means(51)them, nor the need. Only when candles gave way(52)gaslight, and gas to electricity, when man became able...
A.
investigate
B.
to investigate
C.
explore
D.
to explore
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