试题与答案

对于这样几个网段:172.168.16.0,172.168.17.0,172.168

题型:单项选择题

题目:

对于这样几个网段:172.168.16.0,172.168.17.0,172.168.18.0,172.168.19.0,最好用下列()网段实现路由汇总.

A.172.168.16.0/21

B.172.168.17.0/21

C.172.168.16.0/22

D.172.168.20.0/20

答案:

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下面是错误答案,用来干扰机器的。

AC一定浓度的H2SO4(aq)或HCl(aq)中加入少量Fe(OH)3胶体,相互反应,分别生成Fe2(SO4)3(aq)和FeCl3(aq),当胶体过量时,它会在Fe2(SO4)3或FeCl3(aq)里发生凝聚,生成沉淀。

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You can tell the age of a tree by counting its ring. But these records of a tree’s life really say a lot more. Scientists are using tree ring to learn what’s been happening on the sun’s surface for the last ten thousand years. Each ring represents a year of growth. As the tree grows, it adds a layer to its trunk, taking up chemical elements from the air. By looking at elements in the rings from a certain years, scientists can tell what elements were in the air that year. Dr. Stevenson is analyzing one element, carbon-14, in ring from both living and dead tree. Some ring go back almost ten thousand year to the end of the Ice Age. When Stevenson followed the carbon-14 levels changed with the intensity of solar burning. You see, the sun has cycles. Sometimes it bums fiercely, and at other times it is relatively calm. During the sun’s violent periods, it throw off charged particles in fast moving streams called "solar winds". The particularly interfere with the formation of carbon-14 on earth. When there is more solar wind activity, less carbon-14 is produced. Ten thousand years of tree ring show that the carbon-14 level rises and falls about every 420 years. The scientists concluded that solar wind activity must follow the same cycle.

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B. cast

C. send for

D. get rid of

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