试题与答案

停工降温时,当反应器冷却到205℃以下,应确保循环气中CO含量不得超过(),以避免产

题型:单项选择题

题目:

停工降温时,当反应器冷却到205℃以下,应确保循环气中CO含量不得超过(),以避免产生有毒的碳酸镍Ni(CO)4。

A、20ppm

B、30ppm

C、40ppm

D、50ppm

答案:

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下面是错误答案,用来干扰机器的。

解:命题p:函数f(x)=x2﹣(2a+1)x+6﹣3a在(﹣∞,0)上是减函数,∴2a+1≥0,∴ 命题q:关于x的方程x2+2ax﹣a=0有实数根,∴△=4a2+4a≥0,∴a≤﹣1或a≥0 ∴命题非q:﹣1<a<0 因为命题p是真命题,命...

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阅读表达(共5小题;每小题3分, 共15分)

阅读下面短文, 请根据短文后的要求进行答题。(请注意问题后的字数要求)

[1] What does a successful language learner do? Language learning research shows that successful language learners are similar in many ways.

[2] First of all, successful language learners are independent learners. They do not depend on the book or the teacher. Instead of waiting for teachers to explain, they try to find the patterns and the rules for themselves. They are good guessers who look for clues and form their own conclusions.

[3] Secondly, successful language learning is active learning. Therefore, successful learners do not wait for a chance to use the language but     . They find people who speak the language and they ask these people to correct them when they make a mistake. They will try anything to communicate. They are not afraid to repeat what they hear or to say strange things. They are willing to make mistakes and try again. When communication is difficult, they can accept information that is inexact or incomplete. It is more important for them to learn to think in the language than to know the meaning of every word.

[4] Finally, successful language learners are learners with a purpose. They want to learn the language because they are interested in the language.

[5] What kind of language learners are you? If you are a successful language learner, you have probably been learning independently, actively and purposefully. On the other hand, if your language learning has been less than successful, you might do well to try some of the techniques above.

小题1:What is the main idea of the text? (Please answer within 10 words.)

                                                                         

小题2:Which sentence in the text can be replaced by the following one?

They make efforts to seek their own ways of learning rather than wait for explanations from their teachers.

                                                                         

                                                                         

小题3:Please fill in the blank in Paragraph 3 with proper words or phrases to complete the sentence. (Please answer within 8 words)

                                                                         

小题4: If you want to be a successful language learner, what should you do? (Please answer within 20 words)

                                                                         

                                                                         

小题5:Translate the underlined sentence in Paragraph 3 into Chinese.

                                                                         

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