下列有机物中,含有两种官能团的是() A.HOOC—COOH B. C.CH2=

题型:选择题

问题:

下列有机物中,含有两种官能团的是(  )

A.HOOC—COOH

B.

C.CH2==CHBr

D.CH3COOC2H5

考点:芳香烃的通式卤代烃苯的同系物
题型:选择题

依次填入下面文字中横线处的语句,与上下文衔接最恰当的一项是(   )

古城长沙                    ,集青山之钟秀,汇江河之磅礴,聚人文之荟萃,融烈英之壮美,物华天宝,人杰地灵。在这块神奇的土地上,岳麓山屏峙其中,秀如琢玉;                     。构成了一幅绚丽多彩的画卷。

文化历史悠久                 

自然景观优美

③ 湘江奔腾北去,碧如飘带      

④ 橘子洲横卧江心,状若长岛

A.①②③④

B.②①③④

C.②①④③

D.①②④③

题型:选择题

 

E

Research on the human brain has been attracting more and more scientists in recent years, just like the booming hi-tech industry. One of the latest research topics is how to change the human brain or combine the computer and the human brain, i.e. to transplant a chip into a human brain. This idea may make everyone’s dream come true. If we compare a human brain to a hard disc(硬盘), what the scientists are doing is to enlarge the capacity of the hard disc. For the time being, there are some difficulties in such transplant experiments, but scientists never give up.

Experiments have started on animals. In 1996, a transplant experiment performed at the Defense and Military Physiology Research Institute in the U.S. turned a bear into a dolphin.

The dolphin was named Ted, and the bear was named Tallin. Using the most advanced technology available, deep and detailed images were made of the memory area in Ted’s brain containing information about swimming by the scientists. They obtained a series of useful information, the signals transferred by the nervous system. Such information was saved into a button-sized chip, which was then transplanted into the action memory area in Tallin’s brain. The information saved on the chip was released by means of electric power.

Recently, another comprehensive memory transplant was performed at the Motor Nerve Research Institute of the University of California. The comprehensive memory transplanted in the experiment included actions, moods, logic, words, images, etc. The experiment involved an entire transplant of the memory area. This was the largest such experiment done so far.

The transplant was performed making a transfer from a dog named “Genius” to a dog named “Idiot”. “Genius” could understand and follow up to 100 gestures and orders made by its master. It was a real genius in memorizing. “Idiot” was the younger brother of “Genius”. It had no contact with people at all since its birth. It became an animal with nothing in its brain, without any memory.

The operation was a complete success. When the two dogs woke up, “Idiot” had grasped all the abilities “Genius” possessed; it was good at memorizing and sensible. It could follow every gesture and any command given by its master. But “Genius” gave no response to its master, and in fact did not recognize him at all.

57. The purpose of the experiment is _____.

A. to combine the computer and the human brain    

B. to enlarge the capacity of human brain

C. to make some stupid dog turn clever          D. to make bear swim

58. Which of the following statements is TRUE?

A. The scientists transferred a button-sized chip with useful information in Tallin’s brain.

B. The first comprehensive memory transplant was performed at the Motor Nerve Research University.

C. The second experiment wasn’t an entire transplant of the memory area.

D. The Idiot was an animal with memory before brain experiment

59. What does the underlined word “success” refer to?

A. The two dogs woke up.

B. They were both good at memorizing.

C. The Idiot grasped all the abilities of Genius.

D. The Genius grasped all the abilities of Idiot.

60. According to the text, we can infer _____.

A. a person can know more after the experiment

B. a bear can swim after being transferred a chip with related useful information

C. a dog can become clever after entire transplant of the memory area

D. it is really good for animals to have been involved in the transplant experiment

题型:选择题

挛缩的定义是?

题型:选择题

进程之间相互协调,彼此之间交换信息,这就是进程间的通信。当系统中各进程并发共享资源,从而使系统资源得以充分利用,这往往表现为 ______。

题型:选择题

在考生文件夹中有文件sj3.vbp及其窗体文件sj3.frm,该程序是不完整的。窗体上有一个名称为Text1的文本框;两个复选框,名称分别为Check1和Check2,标题分别为“Item1”和“Item2”;一个按钮,标题为“选择”。要求程序运行后,如果Check1和Check2都不选,单击窗体后,则在文本框中什么都不显示;如果只选中Checkl,单击按钮,则在文本框中显示“选中Item1”;如果只选中Check2,然后单击按钮,则在文本框中显示“选中Item2”;如果同时选中Check1和Check2,单击窗体,则在文本框中显示“不能全选”。程序运行时窗体显示如图1—3所示。

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