以下关于蜂窝织炎临床表现的描述正确的有()A．好发于四肢、面部、外阴和肛周等部位 B

“三平”精神就是“平凡之中的伟大追求，平静之中的满腔热血，（），这是新时期的福建精神，是推动福建发展的重要力量，也是欠全面建设小康社会和建设海峡西岸经济区极其需要的精神支撑。

A．平常之中的强烈责任感

B．平常之中的责任心

C．平常之中的成就感

如图所示，半径R=0.5m的光滑半圆轨道竖直固定在高h=0.8m的光滑水平台上，与平台平滑连接，平台长L=1.2m．可视为质点的两物块m₁、m₂紧靠在一起静止于平台的最右端D点，它们之间有烈性炸药．现点燃炸药，假设炸药释放出来的能量全部转化为物块m₁、m₂的机械能，且它们只具有水平方向的速度．m₁通过平台到达半圆轨道的最高点A时，轨道对它的压力大小是N=44N，水平抛出后在水平地面上的落点与m₂的落点相同．已知m₁=2kg，g取10m/s²．求：

（1）m₁到达半圆轨道最高点A时的速度大小

（2）m₂的质量

（3）炸药释放出来的能量．

企业职工伤亡事故统计实行以( )为主的制度。

A．全国统一考核

B．省市考核

C．地区考核

D．城镇考核

Learning a Second Language

Some people learn a second language easily. Other people have trouble learning a new language. How can you help yourself learn a new language, such as English? There are several ways to make learning English a little easier and more interesting.

The first step is to feel positive about learning English. If you believe that you can learn, you will learn. Be patient. You do not have to understand everything all at once. It is natural to make mistakes when you learn something new. We can learn from our mistakes. In other words, do not worry about taking risks,

The second step is to practice your English. For example, write in a journal, or diary, every day. You will get used to writing in English, and you will feel comfortable expressing your ideas in English. After several weeks, you will see that your writing is improving. In addition, you must speak English every day. You can practice with your classmates outside class. You will all make mistakes, but gradually you will become comfortable communicating in English.

The third step is to keep a record of your language learning. You can write this in your journal. After each class, think about what you did. Did you answer a question correctly? Did you understand something the teacher explained? Perhaps the lesson was difficult, but you tried to understand it. Write these accomplishments in your journal.

You must be positive about learning English and believe that you can do it. It is important to practice every day and make a record of your achievements. You will enjoy learning English, and you will feel more confidence in yourself.

66.To feel positive about learning English means _______.

A.if you are patient, you will learn

B.you can understand everything all at once

C.if you make mistakes, you can learn from your mistakes

D.if you believe you can learn, you will learn

67._____ follows in addition.

A.More information   B. The same information  C.The result  D. The opposite information

68.When you learn English, you do not need to ______.

A.be patient                        B. make mistakes

C. express your ideas in English        D. understand everything all at once

69.What is not helpful for you to enjoy learning English?

A.To communicate in English.                    B.To worry about taking risks.

C.To think about what has been done after each class.  D.To make a record of the achievements.

70.What is the main idea of this passage?

A.It is very important to learn a second language.

B.Some people learn a second language easily. Other people do not.

C.There are ways to help you learn a second language more easily.

D.Don’t worry about taking risks when learning a second language.

滚珠丝杠预紧的目的之一是（）。

A.防止油液泄漏

B.提高传动刚度

C.减少磨损

D.防松