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 成人高等教育 / 有机化学
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σ键可以自由旋转,电子云流动性大,易极化;π键不能自由旋转,电子云流动性小,不易极化

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  • 高等数学
  • 在车门打开状态或车门控制单元出现故障时列车仍然可以启动行驶。________(A) 正确 (B) 错误城市轨道交通概论
  • 世界上最早的教育专著是(   )。 小学教育学
  • TCR属于 A、 A.mIgM B、 B.Ig超家族 C、 C.mIgD D、 D.mIg E、 E.以上都不是免疫学基础
  • 题型描述: 阅读理解A characteristic of American culture that has become almost a tradition is to respect the self-made man - the man who has risen to the top through his own efforts, usually beginning by working with his hands. While the leader in business or industry or the college professor occupies a higher social position and commands greater respect in the community than the common laborer or even the skilled factory worker, he may take pains to point out that his father started life in America as a farmer or laborer of some sort.This attitude toward manual (体力的) labor is now still seen in many aspects of American life. One is invited to dinner at a home that is not only comfortably but even luxuriously (豪华地) furnished and in which there is every evidence of the fact that the family has been able to afford foreign travel, expensive hobbies, and college education for the children; yet the hostess probably will cook the dinner herself, will serve it herself and will wash dishes afterward; furthermore, the dinner will not consist merely of something quickly and easily assembled from contents of various cans and a cake or a pie bought at the nearby bakery. On the contrary, the hostess usually takes pride in careful preparation of special dishes. A professional may talk about washing the car, digging in his flowerbeds, painting the house. His wife may even help with these things, just as he often helps her with the dishwashing. The son who is away at college may wait on table and wash dishes for his living, or during the summer he may work with a construction gang on a highway in order to pay for his education.1、 From Para. 1, we know that in America _ _ _ _ _ _ _ _ _ . A. people feel painful to mention their fathers as labors B. people tend to have a high opinion of the self-made man C. college professors win great respect from common workers D. people can always rise to the top through their won efforts 2、 According to the passage, the hostess cooks dinner herself mainly because _ _ _ _ _ _ _ _ _ . A. she can hardly afford servants B. servants in America are hard to get C. she takes pride in what she can do herself D. It is easy to prepare a meal with canned food 3、 The underlined expression "wait on table" in Para. 2 means " _ _ _ _ _ _ _ _ _ ". A. wait to lay the table B. keep accounts for a bar C. serve customers in a restaurant D. work in a furniture shop 4、 The authorˊs attitude towards manual labor is _ _ _ _ _ _ _ . A. humorous B. negative C. critical D. positive 5、 Which of the following could be the best title of the passage? _ _ _ _ _ _ _ _ A. A Respectable Self-made Family B. The Development of Manual Labor C. American Attitude toward Manual Labor D. Characteristics of American Culture统考英语B
  • 105、下列各类进制的整数中,______值最大。 A.八进制数11 B.十六进制数11 C.二进制数11 D.十进制数11计算机统考