以下哪些方法可以在不提高发射功率的情况下带来增益（） A.跳频 B.调天线 C.分集

某次数学竞赛设一、二、三等奖．已知：①甲、乙两校获一等奖的人数相等；②甲校获一等奖的人数占该校获奖总人数的百分数与乙校相应的百分数的比为5：6；③甲、乙两校获二等奖的人数总和占两校获奖人数总和的20%；④甲校获三等奖的人数占该校获奖人数的50%；⑤甲校获二等奖的人数是乙校获二等奖人数的4.5倍．那么，乙校获一等奖的人数占该校获奖总人数的百分数等于多少？

阅读理解。

     Nervous suspects (嫌疑犯) locked up in Britain's newest police station may feel relieved by a

pleasant yellow color on the door. If they are close to confessing a crime (招供), the blue on the wall

might tip the balance.

     Gwent Police have stopped using colors such as greys and browns of the 20th-century police cell

(牢房)and have used color psychology to decorate them.

     Ystrad Mynach station, which recently opened at a cost of ￡5 million, has four cells with glass doors

for prisoners who suffer from claustrophobia (幽闭恐怖症). Designers have painted the frames yellow, which researchers say is a calming color. Other cells contain a royal blue line because psychologists

believe that the color is likely to encourage truthfulness.

     The station has 31 cells, including 12 with a "live scan" system for drunken or disturbed prisoners,

which detects the rise and fall of their chest. An alarm alerts officers if a prisoner's breathing stops and

carries on ringing until the door is opened.

     Designers and psychologists have worked for years on color. Blue is said to suggest trust, efficiency,

duty, logic, coolness, thinking and calm. It also suggests coldness and unfriendliness. It is thought that

strong blues will stimulate clear thought and lighter, soft colors will calm the mind and aid concentration.

     Yellow is linked with confidence, self-respect and friendliness. Get the color wrong and it could cause

fear, depression and anxiety, but the right yellow can lift spirits and self-respect.

     Ingrid Collins, a psychologist who specializes in the effects of color, said that color was an "energy

force". She said, " Blue does enhance (improve) communication but I am not sure it would enhance

truthful communication."

     Yellow, she said, affected the mind. Red, on the other hand, should never be considered because it

could increase aggression. Mrs. Collins praised the designers for using colors in the cells. Gwent is not

the first British force to experiment with color to calm down and persuade prisoners to co-operate. In

the 1990s Strathclyde Police used pink in cells based on research carried out by the US Navy.

1. The expression "tip the balance" in paragraph 1 probably indicates that the blue might _______.

A. let suspects keep their balance

B. help suspects to confess their crimes

C. make suspects cold and unfriendly in law court

D. enable suspects to change their attitudes to colors

2. Which of the following colors should NOT be used in cells according to the passage?

A. Pink.

B. Yellow.

C. Blue.

D. Red.

3. Which of the following helps alert officers if someone stops breathing?

A. Scanning equipment.

B. Royal blue lines.

C. Glass doors.

D. Yellow frames.

4. The passage is mainly concerned with __________.

A. the relationship between colors and psychology

B. a comparisons of different functions of colors

C. the use of colors in cells to affect criminals' psychology

D. scientific ways to help criminals reform themselves in prison

5. What's the author's attitude toward the change of the color in prison?

A. Against.

B. Favorable.

C. Passive.

D. Excited

颈内静脉穿刺的并发症有（）

A.臂丛神经损伤

B.星状神经节损伤（霍纳综合征）

C.气胸

D.血气胸

E.血肿

Make sure the door is______shut before you leave.

A．lastly
B．soundly
C．fast

D．sound

中国铁路高速动车组简称（）。