检波器的自然频率也是检波器的固有频率，由检波器弹性系统的结构和材料决定。

社会工作者小单家在外地，本地没有什么朋友。逢年过节，小单都会不同程度地出现情绪低落的状况，需要一段时间才能调整好工作状态。机构督导杨老师在专业上对小单帮助很大，但在年终评议时，小单给杨老师提意见，希望杨老师不要只谈专业，也要关心她的生活。针对小单的意见，杨老师正确的做法是（）。

A.结束督导关系

B.告诉小单专业知识和能力的重要性

C.适当提供情感支持

D.为小单介绍新的督导

下列事项中，承包方要求的费用索赔不成立的是( )。

A．建设单位未及时供应施工图纸

B．施工单位施工机械损坏

C．业主原因要求暂停全部项目施工

D．因设计变更而导致工程内容增加

北京填鸭的肌肉组织比九斤黄的肌肉组织要粗糙些。

阅读表达。

     Feeling tired lately? Has the doctor said he can't find anything wrong with you? Perhaps he sent you to a

hospital, but all the advanced equipment there shows that there is nothing wrong.

     Then consider this, you might be in a state of sub-health (亚健康).

     Sub-health, also called the third state or grey state, is explained as an indefinite (不确定的) state between

health and disease. According to an investigation by the National Health Organization, over 45 percent of sub-

health people are middle-aged or elderly. The percentage is even higher among people who work in management

position as well as students around exams.

     Symptoms (症状) include a lack of energy, depression, slow reaction, insomnia, worries and poor memory.

Other symptoms include shortness of breath, sweating and aching on the waist and legs.

     The key to preventing and recovering from sub-health, according to some medical experts, is to form good

living habits, alternate (交替) work with rest, exercise regularly, and take part in open air activities.

     As for meals, people are advised to eat less salt and sugar. They should eat more fresh vegetables, fruits and

fish, because they are rich in nutritional elements-vitamins and tiny elements-those are important to the body.

     Nutrition experts point out that it is not good to eat too much at one meal because it may cause unhealthy

changes in the digestive tract. They also say that a balanced diet is _____.

1. What is the best title of the passage? (Please answer within 10 words.)

    _______________________________________________________________________________________

2. Which sentence in the passage can be replaced by the following one? If you feeling weak, depressed, have

    a slow reaction, poor memory and can't sleep well, you are most likely to have suffered sub-health.

    _______________________________________________________________________________________

3. Please fill in the blank with proper words or phrases. (Please answer within 10 words.)

    _______________________________________________________________________________________

4. Which of the suggestions do you think is the most important? Why? (Please answer within 30 words.) 

    _______________________________________________________________________________________

5. Translate the underlined sentence in the first paragraph into Chinese. 

    _______________________________________________________________________________________

精密测量的器具，如外径千分尺等，都有一块橡层，是为了便于测量者拿放量具时不从手中滑落。