问题 问答题

小明家新买了一台电热油汀取暖器,如图所示。当小明用力晃动这台取暖器时,可以听到其内部发出了液体流动的声音。小明找出说明书仔细阅读后得知,这种取暖器将电热管安装在散热片腔体内的下部;在腔体内电热管周围注有导热油;在控制电路中装有双金属温控元件,当油温达到调定温度时,温控元件会自行断开电源;在使用注意事项中特别强调这种取暖器不能倒置或侧卧使用。请回答:

(1)为什么用油做导热物质而不用水?

(2)取暖器内部发出了液体流动的声音,说明油没有装满,这是为什么?

(3)为什么强调不能上下倒置或放倒后通电加热?

答案

(1)油是绝缘体,使用较安全。(2)加热时.油体积要膨胀,若腔体内注满油,易胀坏腔体,引起事故。(3)避免电热管露出油面,在这种情况下,通电加热有可能导致电热管处于油面以上的部分由于温度过高而损坏。

(1)电热油汀里盛的是油,比热容小吸收相同的热温度升的高.从安方面全考油是绝缘体,不导电,用起来更安全

(2)加热时.油体积要膨胀,若腔体内注满油,易胀坏腔体,引起事故。

(3)不能上下倒置或放倒后通电加热,避免电热管露出油面,在这种情况下,通电加热有可能导致电热管处于油面以上的部分由于温度过高而损坏。

多项选择题
阅读理解

阅读理解。

     下栏是6条售房信息,请你根据上栏5位购房者的个人意愿,帮助他们找到一套合适的房源,

选项中有一项是多余选项。

       1   . Jack just moved to a new place in Nelson. He wants to buy a house, but he hasn't much money and

his job is not well paid. So he needs a house whose price is about£50,000 and at least has two bedrooms.

         2   . Lucy is now 65 years old. She is not very healthy and it is difficult for her to move. So she now

wants to find a bungalow (平房) in Earby so that she can easily go out of the house to enjoy the sun in winter

and fresh air outside in summer.

         3   . Alice was very poor before, but recently she got a highly paid job and wanted to change her house

into a better one. But the house should at least have four bedrooms and two reception rooms. What's more, it

should look like the house in the countryside.

         4    . Peter now lives in Nelson. He dreams of having a house with at least three bedrooms. Besides, he

doesn't like high buildings. 

       5   . Lynne has lived in Newchurch for many years and now she wants to buy a house for a change. She

wants the house to be semi-detached (半独立式) or detached. She also wants a separate garage.

     A. Top Barn Lane, Newchurch, Lancashire, £49,950, flat on 30th floor.2 bathrooms with 3-piece suite

in white, 1 reception room, 1 large lounge, 1 fully fitted kitchen,2 double bedrooms.

      B. Queensway, Newchurch, Lancashire, £109,500, semi-detached house. 2 countryside view fronts, 2

double bedrooms, 1 modern fitted dining room, 1 detached garage opposite.

     C. White Leys Close, Earby, Barnoldswick, £129,950, bungalow. 2 bathrooms, 1 reception room, 1 living

room split into sitting and dining areas, doors to garden, a kitchen with a range of fitted bases. Outside of the

front is a road for two cars and a garden area.

     D. Birch Hall Lane, Earby, Barnoldswick, £180,000. 5 bedrooms, 3 bathrooms, 3 reception rooms.

Traditional stone built houses next to some cottages(村舍) on one side. There is a small cycle store and a long,

beautiful wildlife garden.

     E. Craven View, Nelson, Lancashire, £185,000. Bungalow, 3 bedrooms with fitted wardrobe, 2 bathrooms, 1 reception room, 1 L-shaped living room with sitting and dining areas, fireplace around, French windows to

back gardens, 1 kitchen with bright lighting.

     F. Farrer Street, Nelson, Lancashire, £ 45,000. A stone built house. Although requiring a degree of

refurbishment (刷新), this two bedroomed house does still offer a good deal. It includes 1 dining kitchen, two

bedrooms, three-piece bathroom, gas fired central heating and the yard to the back.