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注意:填写答案时要写 大写字母 ,不要写小写字母, 注意题号顺序。 201 7 年 6 月四级考试全真试卷( 1 ) 听力部分 Part II Listening Comprehension (25 minutes) Section A Questions 1 and 2 are based on the news report you have just heard. 1. A) The self-driving system was faulty. B) The car was moving at a fast speed. C) The man in the car was absent-minded. D) The test driver made a wrong judgment. 2. A) They have generally done quite well. B) They have caused several severe crashes. C) They have posed a threat to other drivers. D) They have done better than conventional cars . Questions 3 and 4 are based on the news report you have just heard. 3. A) He is a queen bee specialist. B) He works at a national park. C) He removed the bees from the boot. D) He drove the bees away from his car. 4. A) They were making a lot of noise. B) They were looking after the queen. C) They were dancing in a unique way. D) They were looking for a new box to live in. Question s 5 to 7 are based on the news report you have just heard . 5. A) The latest test on a rare animal species. B) The finding of two new species of frog. C) The second trip to a small remote island. D) The discovery of a new species of snake. 6. A) He fell from a tall palm tree by accident. B) A snake crawled onto his head in his sleep. C) He discovered a rare frog on a deserted island. D) A poisonous snake attacked him on his field trip. 7. A) From its origin. B) From its length. C) From its colour. D) From its genes.
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【简答题】在流化床反应器中,催化剂的平均粒径为 51*10 -6 m ,颗粒密度 ρ P = 2500 kg·m -3 ,反应气体的密度为 1 kg·m -3 ,粘度为 4*10 -2 mPa·s 。试求初始流化速度。
【简答题】党的报告提出要“坚决维护国家海洋权益,建设( )”。 A. 海洋国家 B. 海洋大国 C. 海洋强国 D. 海洋中国
【简答题】在流化床反应器中, 催化剂 的平均粒径为 5 . 1 * 10 -5 m ,颗粒密度 ρ P =2500 kg·m -3 ,反应气体的密度为 1 kg·m -3 ,粘度为 4 * 10 -2 mPa·s 。试求逸出速度 。
【单选题】哌替啶属于什么结构类型?
A.
苯基哌啶类
B.
苯乙醇胺
C.
氨基酮类
D.
哌嗪类
【简答题】党的报告提出要“坚决维护国家海洋权益,建设( )”。 A.海洋大国 B.海洋中国 C.海洋国家 D.海洋强国
【单选题】党的十八大报告提出要“坚决维护国家海洋权益,建设
A.
海洋大国
B.
海洋中国
C.
海洋国家
D.
海洋强国
【单选题】我国未来的航母将采用自行研制的电磁弹射器。电磁弹射系统由电源、强迫储能装置、导轨和脉冲发生器等组成。其工作原理如图所示。利用与飞机前轮连接的通电导体在两平行金属导轨的强电流产生的磁场中受到安培力的作用加速获得动能.设飞机质量 m = 1.8 × 10 4 kg ,起飞速度为 v = 70 m /s ,起飞过程中所受平均阻力恒为机重的1/5 ,在没有电磁弹射器的情况下,飞机从静止开始在恒定的牵引力作...
A.
在没有电磁弹射器的情况下,飞机所受牵引力 F = 2.46 × 10 5 N
B.
在没有电磁弹射器的情况下,飞机所受牵引力 F = 2.1 × 10 5 N
C.
在电磁弹射器与飞机发动机同时工作时,若只增大电流,则起飞的距离将更大
D.
在电磁弹射器与飞机发动机同时工作时,电磁弹射器对飞机所做的功 W = 2.94 × 10 8 J
【单选题】按化学结构分类,哌替啶属于哪种类型
A.
生物碱类
B.
吗啡喃类
C.
苯吗喃类
D.
哌啶类
【单选题】按化学结构分类,哌替啶属于哪种类型
A.
生物碱类
B.
吗啡烃类
C.
苯吗喃类
D.
苯基哌啶类
【单选题】按化学结构分类,哌替啶属于哪种类型
A.
吗啡喃类
B.
苯吗喃类
C.
哌啶类
D.
氨基酮类
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