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3[多选题]
各种模拟调制方式各方面性能正确的是( )


A.抗噪声性能FM最好

B.频谱利用率SSB最高


C.功率利用率FM最高


D.设备复杂度AM最简


E.设备复杂度AM最复杂

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  • 名词解释 人力资源信息系统人力资源规划
  • 1[填空题]  When Liu Kaiqu was young he was poor in Shanghai.One day he 31  a picture of a tiger and tried to sell it on the street.It caught the   32   of an American,who sked,“How much does it cost?”He said,“500 dollars.”The foreigner thought it was too  33  and asked again,“Can you make it cheaper?”He answered,“No,”Then he tore(撕)it to pieces.In great   34  ,the foreigner said,“Young man,are you angry?”“No,sir.I’m not angry.I sold it   35  500 dollars because I thought it was worth the    36   .But you wanted a lower price.It means   37  didn’t think so and it is not good enough.I’ll go on working   38   until my customers(顾客)are satisfied.”At that time,  39  Liu Kaiqu was not famous at all,he never   40  his dream.Now he is well-known all over the world as a great artist.31. A. stole     B. picked   C. drew  D. saw                32. A. attention  B. instruction   C. decision  D. discussion    33. A. terrible  B. big  C. old  D. dear                     34. A. fear  B. difficulty  C. surprise  D.  excitement         35. A. over  B. for  C. about  D. among                     36. A. size  B. price   C. weight  D. position                 37. A. we  B. he  C. you  D. it                             38. A. faster and faster  B. better and better C. slower and slower  D. harder and harder39. A. though  B. because  C. whether  D. until              40. A. broke off   B. cut up  C.  gave up  D. sent off  大学英语
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  • 当原有决策方案实施后,主客观情况发生了重大变化,原有的决策目标无法实现时,要对原决策目标或方案进行根本性的修正,这就是A、追踪决策B、战略决策C、战术决策D、经验决策领导学
  • 高等数学 C
  • 传奇的概念变化了四次。在唐代指小说;宋指诸宫调;元代指杂剧;明清指( )之长者。 中国古代小说专题