我国铁路编入货物列车的关门车数不得超过现车总辆数的( )。A．3% B．4% C．

关于隐蔽工程与重新检验的说法不正确的是( )。

A．工程师未能按规定时间提出延期要求，又未按时参加验收，承包人可自行组织验收，该检验应视为工程师在场情况下进行的验收

B．工程师没有参加验收，当其对某部分的工程质量有怀疑，不能要求承包人对已经隐蔽的工程进行重新检验

C．无论工程师是否参加了验收，当其对某部分的工程质量有怀疑，均可要求承包人对已经隐蔽的工程进行重新检验

D．重新检验表明质量不合格，承包人承担由此发生的费用和工期损失

阅读理解。

     Well, somebody had to be the richest man on earth, but why did it have to be him? William Henry Gates

Bill, now just called "Bill Gates" or "Bill G". William Henry Gates was born in Seattle. In 1973, Gates entered

Harvard University as a freshman (新生). But his heart was not in his studies. After locating (定位) the

school's computer centre, he lost himself in the world of computers once again. Gates would spend many

long nights in front of the school's computer and the next days sleeping in class. So in his junior year, Gates

left Harvard to devote his energies to designing programs for personal computers, which had just entered the

marketplace. In his junior year, Gates left Harvard to devote his energies to Microsoft, a company he had

begun in 1975 with his childhood friend Paul Allen.

     In 1980, the International Business Machines Corporation (IBM) chose Microsoft to develop the operating

system for its first personal computer, the PC. An operating system is a special type of program that contains

instructions for the operation of the computer. Gates devised the Microsoft Disk Operating System (MS-DOS)

for the IBM. Millions of copies of MS-DOS were sold for use in the IBM and IBM-compatible (兼容的) PC's.

     Microsoft continued to grow under Gates' guidance. In 1985, the company introduced the first of a series

of PC programs called windows. These programs enable users to perform multiple (多样的) tasks through

"windows" on the computer screen and to issue (发布) commands by pointing at on screen symbols rather

than by typing instructions. Microsoft has sold milljons of copies of windows. In 1998, the United States

Justice Department, along with 20 state attorneys (律师; 代理人) general, filed an antitrust (反垄断的) lawsuit

against Microsoft. The lawsuit (案件) charged that Microsoft used unfair practices to destroy its competitors.

1. Gates ____.

A. alone set up the first software company in the world

B. began to make the personal computer with his classmate

C. founded Microsoft in 1975 by himself

D. and Allen started to set up the Microsoft in 1975

2. Which of the following words have the closest meaning with the word "devised" in the third paragraph?

A. Made.

B. Find out.

C. Developed.

D. Thought of.

3. What system did the International Business Machines Corporation (IBM) choose Microsoft to develop for

    its first personal computer?

A. It was a special type of operating system that contained instructions for the computer.

B. It was a system which carried out a series of commands.

C. It was a system which performed multiple tasks through "windows" on the computer screen.

D. It was a design program.

4. Which of the following is the CORRECT order for Gates' lifetime?

    a. Gates was chosen to develop the operating system.

    b. An antitrust lawsuit was filed against Microsoft.

    c. Microsoft introduced Windows.

    d. Gates devised the MS-DOS for IBM.

A. a,b,c,d

B. a,d,c,b

C. d,c,a,b

D. b,a,d,c

经皮电神经刺激疗法主要用于：()

A．术后伤口痛

B．神经痛

C．截肢残端痛

D．骨折

E．中枢性瘫痪后感觉运动功能障碍

经常参加体育锻炼的人，能使骨骼发生良好的变化，肌附着处的（）增大，（）增厚、（）的骨小梁增粗，而且排列的更规则更整齐。

A.骨密质、骨突、骨松质 

B.骨突、骨密质、骨松质 

C.骨密质、骨突、骨松质 

D.骨松质、骨密质、骨突

支持子程序调用的数据结构是

A．栈

B．树

C．队列

D．二叉树