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按照课程计划对课程设置实施的要求来划分，分为______和______。
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(哈尔滨工业大学2007年秋季学期期末考试试题)解释层流、紊流。
Mr Mitsuyasu Ota, the Mayor of Hirate, in western Japan, made this week"s news columns after imposing a one-day-a-week ban on the use of computer equipment in the town"s municipal offices. The step was taken on the grounds that young staff "mistakenly think they are working" when sitting attentively at their computer screens. At the same time, Mr Ota lamented that "young people are not in the habit of writing by hand any more".One of the favourite arguments brought out by the opposition in technology wars is the notion that a technical short cut is simultaneously a kind of mental impoverishment, and that the man with the pen will think and write more effectively than the man with the Compaq.Leaving aside the question of whether advanced technology makes you think less dynamically, the idea that there should be recognisable stylistic discrepancies between the work of pen-pushers and key-tappers shouldn"t in the least surprise us. Historically, literary styles have always borne a strong relationship to the available technology. The quill pen, most obviously, allowed its owner only a certain number of words between refills, thereby encouraging all those lengthy Gibbonian sentences crammed with subordinate clauses. The fountain pen—which allowed you to write as many words as you wanted—and the manual typewriter created further revolutions. It is not particularly far-fetched, for example, to suggest that the elliptical prose of early-20th-century Modernist masters such as Hemingway derives in part from its having been typed, rather than written down.But what about the computer screen What effect does that have on the elemental patterns by which the writer downloads the words in his or her head Without wanting to sound like Mayor Ota, I suspect that to a certain kind of writer it is as much a hindrance as a help. A single glance at the average bookshop will demonstrate that novels are getting longer. There are excellent aesthetic reasons for that, of course, but there is also a technical explanation. Which is to say that computers allow you to write more words and to write them more quickly, without the restraint of having to alter everything by hand and then rewrite.Every so often, as a reviewer, one stumbles with a sinking heart across one of these enormous wordy affairs, which, however assiduous the attentions of its editor, betrays its origin as a screen-aided mental show-off. Perhaps, like the municipal employees of Mayor Ota"s Hirate, we should all try banning computers one day a week. Which of the following statements does the author support
试论合同保全制度中的撤销权。
甲公司有300立方米的木材要加工成家具，乙公司与丙公司一起找到甲公司，三方签订了合同，合同约定，乙公司与丙公司将300立方米的木材加工成家具，合同履行期为50天，价款为60万元。乙公司与丙公司也签订了一份合同，约定乙公司负责加工200立方米，丙公司负责加工100立方米，所取得的价款以及所承担的责任也照此比例处理。在加工过程中，因为乙公司工作人员抽烟，导致60立方米的木材被烧毁。合同履行期满后，乙公司与丙公司将全部木材加工成了家具，但乙公司交付的数量不足。甲公司要求乙公司与丙公司连带赔偿损失，丙公司拒绝承担责任。三方无法协商一致，甲公司要求丙公司交付家具，丙公司提出，甲公司不交付价款，自己便拒绝交付家具。甲公司索性通知丙公司解除合同。请回答下列问题： 丙公司如果赔偿了甲公司的损失，是否有权向乙公司追偿为什么
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