若x+y=10,xy=24,则(x-y)2=( )

题型:填空题

问题:

若x+y=10,xy=24,则(x-y)2=(    )

考点:完全平方公式
题型:填空题

汽化热是指( )。

A.单位质量的液体变成与其处于平衡状态的蒸汽所吸收的热量
B.单位质量的液体变成与其处于平衡状态的蒸汽所释放的热量
C.在标准大气压下,液态物质沸腾所释放的热量
D.在标准大气压下,从露点到沸点的热量差

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Maybe you are an average student. You probably think you will never be a top student. This is not necessary so, however. Anyone can become a better student if he or she wants to. Here’s how:
1. Plan your time carefully. When you plan your week, you should make a list of things that you have to do. After making this list, you should make a schedule of your time. First your time for eating, sleeping, dressing, etc. then decide a good, regular time for studying. Don’t forget to set aside enough time for entertainment. A weekly schedule may not solve all your problems, but it will force you to realize what is happening to your time.
2. Find a good place to study. Look around the house for a good study area. Keep this space, which may be a desk or simply a corner of your room, free of everything but study materials. No games, radios, or television! When you sit down to study, concentrate on the subject.
3. Make good use of your time in class. Take advantage of class time to listen to everything the teachers say. Really listening in class means less work later. Taking notes will help you remember what the teacher says.
4. Study regularly. When you get home from school, go over your notes. Review the important points that your teacher mentioned in class. If you know what your teacher is going to discuss the next day, read that material will become more meaningful, and you will remember it longer.
5. Develop a good attitude about tests. The purpose of a test is to show what you have learned about a subject. They help you remember your new knowledge. The world won’t end if you don’t pass a test, so don’t be overly worried.
There are other methods that might help you with your studying. You will probably discover many others after you have tried these.
How to become a better student
General method
How to
Advantage
Plan your time carefully
Make a list
Force you to realize小题1: ____ is happening to your time
Make a 小题2:_____
Find a good place to study
Free of everything but study小题3: ______
You can 小题4:______on the subject
Make good use of your time in class
Listen to everything the teachers say
Really listening in class means 小题5:______ work later
Taking 小题6:______
Study regularly
Go over your notes
 
小题7:______ new material
Help you小题8:_____it better , remember it longer
Develop a good attitude about tests
Don’t be小题9:______ worried
Remember your new
小题10:_____
 
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如果决策者对情况不完全了解,对评价缺乏经验,决策者本身需要补充主观判断;管理者能力有限,提出方案只占可行方案的极少数:决策的效果受决策者技能、价值观和知识的影响。那么这类决策模式是______。

A.理性模式(R模式)

B.有限理性模式(B模式)

C.有效理性模式(F模式)

D.非理性模式(N模式)

题型:填空题

信息的安全级别一般可以分为机密、()、普通

A.秘密

B.私密

C.低密

D.绝密

题型:填空题

键盘与计算机之间的通信是()通信。

A.单工

B.半双工

C.双工

D.双向自动

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