题目内容

A system has a critical need for network services on a small network with a limited number of hosts. System overhead is not a concern. Which of the following should the system administrator do to help ensure connectivity in the event of a gateway failure?()

A. Use the ifconfig command to enable dead gate detection
B. Use the no command to set active dead gateway detection
C. Use the route command to set active dead gateway detection
D. Add the line active_dgd=1 to the /etc/gated.conf command and refresh the gated daemo

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1768年,英国著名化学家约瑟夫.普利斯特,将碳酸气直接溶解在水里取得了和天然矿泉水一样的效果,开始于汽水的萌芽,到1820年,()国药剂师史特鲁夫创造的人造矿泉水成功,继而根据人们的需要,再添加有机酸,香料和糖,才出现了真正的汽水。

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植物绿枝嫁接的最佳时期是()。

A. 落叶前后
B. 萌芽前后
C. 新梢速长期
D. 果实采收前后

简述砖砌条形基础的组成。

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