简述利率平价理论的主要内容。

一块正方形麦田边长300米，如果用射程是10米的自动旋转喷灌装置进行喷灌，大约需要多少个这样的装置？

设有命令按钮Command 1的单击事件过程，代码如下：
Private Sub Command1_Click()
Dima(3，3)As Integer
For i=1 To 3
For j=1 To 3
a(i，j)=i*j+i+j
Next j
Next i
Sum=0
For i=1 To 3
Sum=Sum+a(i，4-i)
Next i
MsgBox Sum
End Sub
运行程序，单击命令按钮，消息框输出结果是______。

What makes Reader’s Digest the most successful magazine in publishing history Beneath the fun and excitement that fill our pages, we are, above all else, a serious magazine. Our readers are serious people. The Digest never loses sight of the fact that each day all of us confront a tough, challenging world. To millions who know our record of viewing this world, we are not a luxury; we are a necessity.

Basic to our magazine is a steady focus on the power of the individual. We show that man’s greatest ideas and accomplishment, his often stunning (极好的) faith and courage and hope, can be seen in the conduct of ordinary men and women. We reflect the universal skepticism that government can solve our problems; we herald the unending promise of self-determination and individual enterprise. Readers depend upon us for truth and accuracy, logic and common sense.

Our stories come from the grit of human experience-the tough, the tender, the funny. These stories—always told in a powerful narrative style—spring from love and caring, from a sense of right and wrong, from a dedication to the vitality (活力，生命力) of the human spirit. We are at the forefront of major issues of medicine, health, environment, human rights. We take readers behind the headlines to the cause and meaning of world events. We celebrate courage, champion adventure and always seek to expand the mind, and to enrich the spirit and the body. It is this clear voice—never preaching (说谎), always showing-that has made readers set us apart from all other magazines.

Deep within our widely varied package of humor, drama, and helpful information, there hums (哼唱) a subtle power that guides people in every aspect of their lives. They listen because what we put forth rings true. They are comfortable with our clear, concise words that inform them, entertain them, and remind them of those eternal values that fortify all decent people as they seek clarity and coherence in a confusing world. Our readers recognize that our compass is good for the long haul-that our principles are good for all seasons, good for all ages, good for all those who wish to play a role in making their world a better place. So long as we never lose sight of these powerful principles that are at the soul of our magazine-and so long as we remain at the cutting edge of life in our world—then we are prepared to lay claim to a future as brilliant and as exciting as our past.

The Reader’s Digrest claims to be a necessity because （）。

A. it provides fun and excitement to its readers

B. it views the world as the ordinary people do

C. it presents people with solutions to life’s problems

D. it has such a long history that every generation is reading it

下列表达式中结果不是日期型的是______。

A．CTOD("2000/10/01")

B．{^1999/10/01}+365

C．VAL("2000/10/01")

D．DATE()

安全防范系统的工程合同是安全防范系统的检测和验收的基本依据。