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市公司网络部综合接入中心和县公司网络部维护室应妥善保存、管理软件版本或补丁安装盘，以磁带、磁盘、光盘等形式保留一份以上的备份，每（）检查一次有效性。

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参考答案：季度

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我国地势的第一级阶梯平均海拔在______米以上；第二级阶梯海拔下降到1000-2000米；第三级阶梯的大部分地区海拔在______米以下．
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单项选择题

The world has never been more closely and intricately connected. Our behavior (51) the environment we all share, and we are tied into a global economy and global communication system. (52) choosing to buy one garment rather than another we help determine whether someone on the other side of the world retains or (53) their job; emissions from one part of the world contribute to a hole in the ozone layer somewhere else; we can (54) with others anywhere via satellites, the Internet and the mobile phone. This interdependency, (55) "connexity", is the defining characteristic of the world today.

However, despite connexity, human beings have also (56) been, more separate. Belief in individual rights and freedoms is at the heart of the West’s world view. People nowadays insist their freedom to (57) how to live, who to love, what to consume and what to believe. In economics, the sovereignty of the consumer and the shareholder is paramount. In politics, the sovereignty of nations remains a (58) concern.

In this inspiring and important book Mulgan argues that our freedom and our connectedness are set or collision course and argues that the (59) way out of our current impasse (僵局) is to go beyond our sense of ourselves as (60) unit, and recognize the webs of mutual responsibility in which we live.

56().

A.ever 

B.once 

C.never 

D.still
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