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 成人高等教育 / 有机化学
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下列醇发生消除反应最容易的是
  • A、

  • B、

  • C、

  • D、

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 佳题速递:
  • 肺的导气部从肺内叶支气管到() 组织学与胚胎学
  • 4、This story is about a young man. He worked very hard at his lessons. He was too busy to have a rest. At last, he couldn't go to sleep. Every night, when he went to bed, he closed his eyes and tried to sleep. But the more he tried, the more he stayed awake. After a while he decided to visit the doctor. “I just can't go to sleep at night. What should I do?” “I have a suggestion,” said the doctor. “Try counting numbers. By the time you reach one thousand, you'll be asleep. I am sure of it.” The next day the man reached the doctor's office. “Well,” said the doctor, “how are you today? Did you try my suggestion?” The man still looked tired. “Yes,” he said, “I tried counting one, two, three...up to one thousand. But when I reached five hundred and sixty-nine, I began to feel sleepy. I had to get up and drink some tea so that I could go on counting up to one thousand, but then I still couldn't fall asleep.”统考英语阅读理解
  • 29、计算机操作系统作为一个接口,连接着______。 A.用户与软件 B.系统软件与应用软件 C.主机与外设 D.用户与计算机计算机统考
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  • 69、杀毒软件不包括下面的______。 A.360杀毒 B.KV3000 C.天网防火墙 D.金山毒霸计算机统考
  • 二阶欠阻尼系统的上升时间为( ) 机械工程控制基础