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《植物检疫条例》规定，县级以上地方各级农业部门所属的植物检疫机构负责行使植物检疫权。此行为属于行政授权。（）
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允许用户在不切断电源的情况下，更换存在故障的硬盘、电源或板卡等部件的功能是（）
攻击者使用无效IP地址，利用TCP连接的三次握手过程，连续发送会话请求，使受害主机处于开放会话的请求之中，直至连接超时，最终因耗尽资源而停止响应。这种攻击被称为（）。
Amongst the most popular books written today are those which are usually classified as science fiction. Hundreds of titles are (1) every year and are read by all kinds of people. (2) , some of the most successful films of recent years have been (3) on science fiction stories.It is often thought that science fiction is a fairly new (4) in literature, but its ancestors can be (5) in books written hundreds of years ago. These books were often concerned (6) the presentation of some form of ideal society, a (7) which is still often found in modern stories.Most of the classics of science fiction, (8) , have been written within the last one hundred years. Books by writers such as Jules Verne and H. G. Wells, to (9) just two well-known authors, have been translated into many languages.Modern science fiction writers don’t write about men from Mars or space adventure stories. They are more interested in (10) the results of technical developments on society and the human mind; or in (11) future worlds which are a reflection of the world which we live in now. (12) this, their writing has obvious (13) implications.In an age where scientific fact frequently (14) science fiction, the writers may find it difficult to keep (15) scientific advances. Those who are (16) clear-sighted to see the way we are going, however, may provide a valuable (17) on how to deal with the problems which society will (18) face as it tries to (19) its new technology and come to terms with a continually (20) view of the world. 13（）
于漪老师在上一节语文公开课时，当她讲到课文中“一千万万颗行星”时，一个同学发问：“老师，‘万万’是什么意思”惹得全班同学哄堂大笑。于老师见状便问大家：“大家都知道‘万万’等于‘亿’，那么，这里为什么不用‘亿’而用‘万万’呢”全班同学的注意力一下子被吸引过来，没有人再发笑了，大家都认真地思考起来，并且发表了自己的看法。在大家讨论完后，于老师进行了总结。最后老师又问了一句：“请大家想想，今天这一‘额外’的收获是怎么来的呢大家要感谢谁呢请让我们用掌声表达对他的谢意!”大家把目光转向那位同学，对他鼓起掌来。请分析上面教学片断中体现的教学原则和教学方法。
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