下列叙述正确的是( ) A.氢氧化钡晶体与氯化铵晶体的反应是放热反应 B.煤、石

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问题:

下列叙述正确的是(  )

A.氢氧化钡晶体与氯化铵晶体的反应是放热反应

B.煤、石油、天然气等是化石燃料

C.直接燃烧煤比将煤进行处理转化为气体或液体燃料再燃烧效果好

D.反应物的总能量高于生成物的总能量时,发生吸热反应

考点:吸热反应、放热反应天然气的综合利用煤的综合利用石油的综合利用
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已知双曲线方程2x2-y2=2.

(1)求以A(2,1)为中点的双曲线的弦所在的直线方程;

(2)过点(1,1)能否作直线l,使l与双曲线交于Q1,Q2两点,且Q1,Q2两点的中点为(1,1)?如果存在,求出它的方程;如果不存在,说明理由.

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当T0为8位定时器、T1为16位定时器时,其TMOD的值应是()

A、12H

B、21H

C、52H

D、61H

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The bicycle is the common sight in our daily life, as a great many Chinese use one every day. But you may not know its role in strengthening international relations, as it did in the case of US President George W. Bush’s visit to China .

President Bush arrived in Beijing on November 19, 2005 after he finished the APEC meeting in South Korea.He met with Chinese top leaders and achieved agreements on trade, Taiwan issue and more.

Although Bush’s trip was short as 40 hours, he managed to spare a moment to do some cycling. On November 20, he rode up and down a steep path at Laoshan Olympic Mountain Bike Course in Beijing’s suburbs.

Six young Chinese cyclists accompanied the president, who was dressed in a Chinese training uniform with the “Beijing 2008” logo (标志). He did not go along the arranged route and chose a more zigzag(曲折的) hiking path.

“How do you say, ‘take it easy on the old man’?” Bush joked to his partners before setting out.

“Compared with my bike path on the Crawford ranch (农场) , this one is greater and really difficult,” said Bush when his 45-minute ride ended. He said he will come to Beijing for the 2008 Olympic Games.

This is not Bush’s first cycle ride in Beijing. In 1975 at the age of 29, he visited the Chinese capital for the first time, when his father was head of the US liaison office (联络处) in Beijing, which Bush described as “fantastic”.

However, observers said Bush’s ride is much more than just his favorite pastime. It expressed friendliness with people in China, where the bicycle is an important part of life and culture.

According to the Washington Post, one of the major newspapers in the US, this was a specially arranged activity by the US Government, for they want to send the Chinese a sign of friendship. “The president is by no means hostile (有敌意的) to China,” it said.

64. What is the first paragraph mainly about?

A. Every Chinese has at least one bicycle

B. The bicycle is the common sight in our daily life

C. Bicycle can play a role in improving relationship between nations

D. President George W. Bush is fond of cycling

65. President George W. Bush went cycling ______.

A. wearing a T-shirt with the “Beijing 2008” logo

B. up and down a path on Laoshan Mountain

C. accompanied by six young Chinese policemen

D. along a more challenging way without arrangement

66. Bush said “take it easy on the old man” to his partners probably because ______.

A. he wanted to make them easy

B. he wanted to make a joke about them

C. he wanted to tell them it would be a more zigzag hiking path

D. he wanted to show them it would be a easy task for an old man

67. Which of the following is TRUE according to the passage?

A. Bush’s first cycle ride was in 1975.

B. Bush’s ride was specially arranged by the Washington Post.

C. Bush’s ride is more a sign of friendship than just his favorite pastime.

D. Bush will come to Beijing to take part in the Olympic cycling games in 2008.

题型:选择题

下列哪一项因素与癫痫发作关系不大()

A.遗传

B.内分泌因素

C.性别

D.脑炎

E.脑部受伤

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在一昼夜中,体温最低的时间是

A.清晨2~6时

B.早晨7~9时

C.午后1~5时

D.傍晚6~7时

E.睡前9~10时

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