Soft Co581占用空间为（）U，Soft Co9500占用的空间为（）U。

令S为由下列条件所规范的空间区域：

S:x≥0,y≥0.z≥0,x+y+z≤h.又设F(u)为u的连续函数．试证：

此处α，β，γ为任意正数．[柳维尔]

A.硬盘空间

B.内存空间

C.U盘空间

D.光盘空间

以下叙述中正确的是

A．函数调用strlen(s)；会返回字符串s实际占用内存的大小(以字节为单位)

B．两个字符串可以用关系运算符进行大小比较

C．当拼接两个字符串时，结果字符串占用的内存空间是两个原串占用空间的和

D．C语言本身没有提供对字符串进行整体操作的运算符

在空间，证设u在空间有界闭域上有二阶连续导数，S是V的边界面n是S的外法向单位向量，证明：

(1)

ort, and convenience. These cars will float along never touching the ground, and therefore will have no need for wheels. Annoying highway vibrations, caused by the rotations of the disc-and-tire wheels, will be things of the past. The coming highway passenger cars will literally fly above the road, supported on columns of air compressed by

turbine-driven fans.

The car without wheels has been called a “flying car” , and, in a sense, that’ s just what it is; however, it will not back out of the family garage, start down the street, and then suddenly go quickly upward heading for some distant point. On the contrary, to avoid problems in aerial navigation, the wheel-less vehicle probably will travel no more than three inches above road surface. It will travel over fairly rough road and even over smooth water.

The inevitable problems of maritime regulations, severe weather conditions, and running out of fuel in remote areas all will require new concepts of operation, servicing, and vehicle regulation.

1.The author believes that cars of the future _______ .

A、will be replaced by airplanes

B、will have wheels unlike those of today

C、will u s e columns of air instead of wheels

D、will u s e wheels without tires

2.Cars of the future will run _______ .

A、without annoying noise

B、without fuel

C、much more smoothly

D、on a number of fans

3.The car without wheels has been called a “flying car” because _______ .

A、it travels a few inches above the ground

B、it can fly as a plane does

C、it moves at a very high speed

D、it can travel over smooth water

4.Where is a wheel-less car least fit to travel_____ .

A、Over soft land

B、Over rough country roads

C、Over highways

D、Over waterfalls

5.Wheel-less cars will _______ .

A、eliminate all traffic problems

B、create new traffic problems

C、eliminate parking problems

D、both A and C

A．Y

B．N

C．NG

A．Help the woman breath easier.

B．Keep the lady passenger calm and warm.

C．Put something soft under the woman's head.

D．Give her some water.

A．raising the legal drinking age from 18 to 21

B．forcing teenagers to obey disciplines

C．develop young people's sense of responsibility

D．pressing teenagers to take soft drinks

In the writer's opinion, Jaschan should______.

A．be severely punished

B．be fired by the software firm Securepoint

C．be arrested immediately

D．be blamed for the crimes

下列报道摘自《美元坚挺的惊讶》(Dollar's Strength a Surprise)，《纽约时报》，p.D1，1989-08-07：

“但是，现在有一种观点认为，经济正在朝”软着陆“的方向行进，经济增长明显放慢，通货膨胀率降低，但经济衰退并没有发生。

这种前景对美元的坚挺是有利的。原因有二：第一，软着陆不像衰退那样具有破坏性，因此，支撑美元的外国投资很可能持续下去：

第二，软着陆不会迫使美联储为刺激增长而降低利率。利率下降会对美元产生贬值的压力，这是因为，利率下降会使美元证券对外国人的吸引力下降，诱使人们抛出美元。此外。由软着陆预期而产生的乐观因素甚至可以抵消一些由利率下降带给美元的贬值压力。”

a．试用本章所学的汇率决定模型解释报道的第三段。

b．还有什么汇率决定因素有助于解释第二段？

The following report appeared in the New York Times on August 7,1989(“Dollar's Strength a Surprise，”p.DI)：

But now the sentiment is that the economy is heading for a“soft landing”with the economy slowing significantly and inflation subsiding，but without a recession．

This outlook is good for the dollar for two reasons．A soft landing is not as disruptive as a recession，so the foreign investments that support the dollar are more likely to continue．

Also，a soft landing would not force the Federal Reserve to push interest rates sharply lower to stimulate growth．Falling interest rates can put downward pressure on the dollar because they make investments in dollar-denominated securities less attractive to foreigners，prompting the selling of dollars．In addition，the optimism sparked by the expectation of a soft landing can even offset some of the pressure on the dollar from lower interest rates．

a．Show how you would interpret the third paragraph of this report using this chapter's model of exchange rate determination．

b．What additional factors in exchange rate determination might help you explain the second paragraph？