测量电流时,在测量之前,要对被测电流大小有个估计,根据待测电流的( )来选择适当的

题型:单项选择题

问题:

测量电流时,在测量之前,要对被测电流大小有个估计,根据待测电流的( )来选择适当的仪表。

A.额定数值

B.大小

C.要求

D.电压高低

考点:施工员电气施工员电气施工员
题型:单项选择题

阅读下列两篇短文,从各小题所给的四个选项中选出能回答所提问题或完成所给句子的最佳答案。

     Some vegetables need a lot of sunshine.A vegetable expert at the University of Marine advised planting these vegetables where they can get eight to ten hours of sunlight a day. Tomatoes, melons, squash and peppers are among those that need the most sunshine.    

     Farmers often feel it needs a lot of sunshine to produce a good crop.  The Rodale Institute in Pennsylvania, however, says that lots of vegetables grow well without much sunshine. The research center published a report about this subject some years ago in its magazine' Organ,ic Garden,in,g. The report says many different kinds of crops from bluebemes to beans can be grown in the shade.      

     The Rodale Institute says a garden should be planned carefully especially if you grow different kinds of vegetables.  For example, rows of vegetables should be planted in an east-west direction.  In that way, as the sun passes overhead, all the plants will receive an equal amount of light.  This is especially important when the plants grow to different heights.    

     Some fruit also grow well without a lot of sunlight. In the United States, bluebemes and several kinds of pears need only a little sunshine each day.  In Asia, the hardy kiwi grows well in the shade.

1. Which plant needs eight to ten hours of sunshine a day according to the expert at the University of

Marine?

A. Blueberries.          

B. Pears.          

C. Beans.        

D. Tomatoes.

2. If we want the plants to receive the same amount of sun- shine, what should we do?    

A. Plant them in an east-west direction.    

B. Plant them in the shade.    

C. Plant them in the high place.    

D. All the above.

3. Which of the followings is NOT true according to the passage?    

A. Not all fruits can giow well in the sun.    

B. Melons need less sunshine than a kiwi.    

C. The magazine Organic Garden,ing is published in America.    

D. We'd better plant the bluebemes and beans in the shade.

4. What kind of articles will appear in the magazine Organ,ic Garden,in,g?   

A. Some secrets about famous people.    

B. How to get cheaper clothes.    

C. Scientific reports.    

D. NBA games.

5. The passage mainly tells us____.  

A. plants, vegetables and the sunshine    

B. crops can grow well without much sunshine    

C. all vegetables need a lot of sunshine    

D. all the fruit can grow well with a little bit of sunshine

题型:单项选择题

培训师的角色有哪些

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富裕,是各族人民群众共同的心愿。南疆三地州人多、地少、收入低,帮助南疆地区各族农牧民脱贫成为“十二五”期间新疆要啃下的“硬骨头”。啃下这块“硬骨头”(  )

①能为巩固南疆地区民族团结奠定坚实的政治基础

②能为南疆地区民族平等、民族团结提供雄厚的物质基础

③才能在南疆地区确立平等团结互助和谐的新型民族关系

④有利于维护新疆的稳定和提高新疆的综合竞争力

A.①②    

B.③④

C.②④

D.②③

题型:单项选择题

AP采用POE供电时,网线中用来供电的线序是()

A.4.5.7.8

B.3.6.7.8

C.1.2.3.6

D.1.2.4.5

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有关流行性腮腺炎的流行病学,正确的是()

A.以1岁以下婴儿多见

B.以冬、春季为主

C.主要通过飞沫传播

D.早期病人和隐性感染者为传染源

E.有脑膜炎表现者可从脑脊液中分离出病毒

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