A high unit labor requirement means high labor productivity.

g unit, most people would prefer to leave it to a licensed professional. However, it is quite possible to repair simple problems by yourself. 1. The main problem usually occurs with the filter just inside the air conditioning unit panel. Most people can change the filter themselves, but they neglect changing their air conditioning filter once a month and it ends up clogging. Be sure to change your filter and try turning the unit off for a few hours to allow any ice to thaw. 2. In addition, a low freon pressure could also be the culprit. The ideal pressure reading should be around 65-70 psi, so you will need freon gauges to get a reading from the high side(the larger of the two freon lines). Freon can slowly escape from the outside unit over time. That is why the unit must be serviced occasionally. 3. When the thermostat is turned down low and the unit inside is not coming on at all, it could be caused by the condenser fan motor. Wire connections could be burning up or may have been loosened by vibration. When this happens, it needs to be replaced. From: Mark Henry＜mhenry@hmail.com＞ To: Customer Service Department＜customerservie@tgelectronics.com＞ Re: Air Conditioning Date: August 25 To whom it may concern, On July 2, I purchased an air conditioning system(model number 369). Although the product came with a one-year limited warranty, I spent an additional $130 and purchased a five-year extended warranty that covers all parts and labor. Two weeks ago I noticed that the air conditioning system was making a strange noise. A visit by the technician on August 10(invoice TB 5789)revealed that the air conditioning systems freon pressure was 50 psi. I was promised that freon gas would be refueled in under a week, but it ended up taking nine days for that to happen. I received a bill today for the cost of the freon gas and repairs. It is my understanding that parts and labor are covered under the warranty, so I should not have received a bill. I appreciate your attention to this matter. Mark Henry

What is the purpose of the document？

A．To explain how to install an air conditioning

B．To inform. users how to deal with mechanical problems

C．To advertise a new air conditioning system

D．To report a damaged air conditioning to a repair center

various industries are determined by the productivity of the least productive unit of labor, i.e., that unit of labor which works in the industry which has the greatest economic disadvantage. We will represent the various opportunities of employment in a country like the United States by symbols: A, standing for a group of industries in which we have exceptional, economic advantages over foreign countries; B, for a group in which our advantages are less; C, one in which they are still less; D, the group of industries in which they are least of all.

When our population is so small that all our labor can be engaged in the group represented by A, productivity of labor (and therefore wages) will be at their maximum. When our population increases so that some of the labor will have to be set to work in group B, the wages of all labor must decline to the level of the productivity in that group. But no employer, without government aid, will yet be able to afford to hire labor to exploit the opportunities represented by C and D, unless there is a further increase in population.

But suppose that the political party in power holds the belief that we should produce every thing that we consume, that the opportunities represented by C and D should be exploited. The commodities that the industries composing C and D will produce have been hitherto obtained from abroad in exchange for commodities produced by A and B. The government now renders this difficulty by placing high duties upon the former class of commodities. This meads that workers in A and B must pay higher prices for what they buy, but do not receive higher prices for what they sell.

After the duty has gone into effect and the prices of commodities that can be produced by C and D have risen sufficiently, enterprisers will be able to hire labor at the wages prevailing in A and B, and establish industries in C and D. So far as the remaining laborers in A and B buy the products of C and D, the difference between the price which they pay for those products and the price that they would pay if they were permitted to import those products duty-free is a tax paid not to the government, but to the producers in C and D, to enable the latter to remain in business. It is an uncompensated deduction from the natural earnings of the laborers in A and B. Nor are the workers in C and D paid as much, estimated in purchasing power, as they would have received if they had been allowed to remain in A and B under the earlier conditions.

When C and D are established, workers in these industries______.

A．receive higher wages than do the workers in A and B

B．receive lower wages than do the workers in A and B

C．are not affected so adversely by the levying of duties as are workers in A and B

D．receive wages equal to those workers in A and B

$600/ton. If the firm is minimizing the cost of resources, it is least likely that the:

A.marginal product per unit of labor is 1/3 ton.

B.marginal revenue product of capital is equal to the price of a unit of capital.

C.ratio of the marginal output per labor unit to labor units employed is at a maximum.

听力原文： Japan's divorce rate rose to a record high last year, reflecting an increasing number of middle-aged and older couples who are parting ways.

The number of divorces rose for a 12th straight year in 2002, according to recently re leased government statistics that provided the latest confirmation that the stigma long associated with breaking up is fading in this country.

According to the Health, Labor and Welfare Ministry, a record 289,836 couples divorced last year, up 1.4 percent from the previous high of 285,911 in 2001.

Behind the rise is an increasing number of couples who are parting ways after being married for 20 years or more: They accounted for 15.7 percent in 1975. The corresponding figure for newlyweds—married five years or less—fell to 34.4 percent from 49 percent.

Divorce is no longer seen as a social taboo in harmony-conscious Japan. But that is slowly becoming a thing of the past, a trend some attribute to a weakening of group-oriented values.

Which of the following groups is defined as "newlyweds"？

A．Couples who are married for less than two years.

B．Couples who are married for less than five years.

C．Couples who are married for more than five years.

D．Couples who are married for more than twenty years.

单位产品劳动投入(unit labor requirement)

hen 2 units of labor and 2 units of capital are employed in the production process, 3 units of good X are produced. This phenomenon is called:

A、monopolistic competition

B、biased growth

C、economies of scale

D、product differentiation

A、the change in total product resulting from an extra unit of labor, holding other factors constant.

B、the ratio of output to the number of workers used to produce that output.

C、the amount of output that can be produced by a given amount of labor.

D、equal to the marginal product of labor when the average product is increasing.

单位产品劳动投入（unit labor requirement) 名词解释

A、output per additional unit of revenue.

B、output per additional unit of labor.

C、revenue per additional unit of labor.

D、revenue per additional unit of output.