下列施工测量仪器中，( )的主要功能是测量两点间高差。 A．经纬仪 B．水准仪

临时用电设施对地电压在（）V以上时，必须作接地或接零保护，零线必须重复接地。

A、24

B、36

C、110

D、220

教学包括教和学两个面。研究教学的一般理论的科学称为教学论，也译作教授学，是教育科学中一个相对独立的分支学科。教学论要解决有关教学方面的理论问题。　　这段话主要支持了这样一个论点，即( )。

A．教学包括教和学两方面

B．教学论是教育科学中一个相对独立的分支学科

C．教学论的研究对象是教学中的一般理论问题

D．教学论是研究教和学两方面理论问题的总称

由于伤病或死亡造成的工资损失，属于

A．直接成本
B．间接成本
C．隐性成本
D．固定成本
E．机会成本

项目在国民经济评价中，直接出口产品的影子价格计算公式为( )。

A．到岸价×影子汇率-贸易费用-国内运杂费

B．离岸价×影子汇率-贸易费用-国内运杂费+出口关税

C．到岸价×影子汇率-贸易费用-国内运杂费-出口关税

D．离岸价×影子汇率-贸易费用-国内运杂费

Fatigue is one of the most common complaints brought to doctors, friends, and relatives. You’d think in this era of labor-saving and convenient transportation that few people would have reason to be so tired. The causes of modern-day fatigue are diverse and only rarely related to excessive physical exertion. Today, physicians report, tiredness is more likely a consequence of underexercise than of wearing yourself down with overactivity.

Physical fatigue is the well-known result of overworking your muscles. (46) Physical fatigue is usually a pleasant tiredness, such as that which you might experience after playing a hard set of tennis, chopping wood, or climbing a mountain. The cure is simple and fast: You rest, giving your body a chance to get rid of accumulated waste and restore muscle fuel.

(47) Illness induced fatigue is a warning sign or consequence of some underlying physical disorder, perhaps the common cold or flu or something more serious like cancer, while other symptoms are present that often suggest the true cause. Even after an illness passed, you’re likely to feel dragged out for a week or more. (48) Take your fatigue as a signal to go slow while your body has a chance to recover fully even if all you had was a cold. Pushing yourself to resume full activity too soon will certainly prolong your period of fatigue.

Emotional problems and conflicts, especially depression and anxiety, are by far the most common causes of prolonged fatigue. When such feelings are not expressed openly, they often come out as physical symptoms, with fatigue as one of the most common manifestations. (49) Understanding the underlying emotional problem is the crucial first step toward curing psychological fatigue and by itself often results in considerable lessening of the tiredness. Professional psychological help or career or marriage counseling may be needed.

There is a great deal you can do on your own to deal with both severe prolonged fatigue and those periodic washed-out feelings. You might try to do moderate exercise. (50) Contrary to what you may think, exercise enhances, rather than drains, engery and helps you to resist fatigue by increasing your body’s ability to handle more of a workload. At the end of a day exercise can relieve accumulated tensions, give you more energy in the evening, and help you sleep more restfully.

(46) Physical fatigue is usually a pleasant tiredness, such as that which you might experience after playing a hard set of tennis, chopping wood, or climbing a mountain.