【判断题】乙酰乙酸乙酯在强碱的作用下和溴乙烷反应,经酮式分解后生成2-戊酮的过程中,经历了脱酸反应。()
【单选题】● Read the following passage. ● Are sentences 16-22 “Right” or 'Wrong'? If there isn't enough information to answer 'Right' or 'Wrong', choose 'Doesn't say'. ● For each sentence 16-22, mark one letter...
【单选题】设全集Ω={1,2,3,4},M={1,3,4},N={2,3,4},则 = ( )
【简答题】向数组a中输入10个整数,编写程序,分别将这10个数中的正数存入数组az中,负数存入数组af中,并分别输出az和af中的内容。
【单选题】•Read the following letter. •Are the sentences (16-22) 'Right' or 'Wrong'? If there isn't enough information to answer 'Right' or 'Wrong', choose 'Doesn't say'. •For each sentence, mark one letter(A, ...
【简答题】Directions: Read the following passage. Answer the questions according to the information given in the passage. I’m not a fast reader and I don’t read as much as many other people, but reading is some...