题目内容

下列历史事件按时间先后排序正确的一组是()。

A. 戊戌变法——马关条约——五四运动
B. 郑和下西洋——戚继光抗击倭寇——郑成功收复台湾
C. 张衡发明地动仪——诸葛亮写《出师表》——张骞出使西域
D. 虎门销烟——中日甲午战争——第一次鸦片战争

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B. 是一次废除土地私有制的革新
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ISO的OSI安全体系结构中,以下哪一个安全机制可以提供抗抵赖安全服务()

A. 加密
B. 数字签名
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D. 路由控制

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