题目内容

两根细长杆，直径、约束均相同，但材料不同，且E1=2E2，则两杆临界应力之间的关系为( )。

A. (σcr)1=(σcr)2
B. (σcr)1=2(σcr)2
C. (σcr)1=(σcr)2/2
D. (σcr)1=3(σcr)2

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SECTION A In this section you will hear a mini-lecture. You will hear the lecture ONCE ONLY. While listening, take notes on the important points. Your notes will not he marked, but you will need them to complete a gap-filling task after the mini-lecture. When the lecture is over, you will be given two minutes to check your notes, and another ten minutes to complete the gap-filling task on ANSWER SHEET ONE. Use the blank sheet for note-taking. Britain The majority of British people work in (1) industries. About 20% work in (2) and 5% in construction. Do-It-Yourself, or D-I-Y as it is known, is a popular (3) activity in Britain. Many people spend their weekends carrying out various improvements to their homes. Other people lovingly tend their gardens. A quarter of the population is involved in some sort of (4) work, helping others without being paid. Britain is an (5) society, and people are often tolerant of each other. Food served in pubs has also become more (6) in recent years. Newspapers in Britain can be divided into two main types: popular and (7) . (8) begins at the age of 5 and finishes at the age of 16. In Britain nowadays many non-married people (9) without getting married. British humor is frequently of a sarcastic kind, but it should not be taken literally or seriously. The British person is simply " (10) ."

患者应采取的体位是

A. 仰卧位
B. 半卧位
C. 左侧卧位
D. 右侧卧位
E. 坐位

"Files" refer to the ______ on the chessboard.

A. horizontal rows
B. vertical rows
C. diagonal rows
D. squares

下列关于曲面方程的结论中，错误的是( )。

A. x+2x2+y2=0表示椭圆抛物面
B. x2+2y2=1+3z2表示双叶双曲面
C. x2+y2-(z-1)2=0表示圆锥面
D. y2=5x表示抛物柱面