【正文】 目前全國(guó)各個(gè)高校的老師覺悟較高，對(duì)太陽能的認(rèn)識(shí)也較早，所以太陽能熱水器在全國(guó)各個(gè)高校普及率明顯高于其他單位，當(dāng)然他們選擇太陽能熱水器的另外一個(gè)重要原因是太陽能熱水器有比較可觀的經(jīng)濟(jì)效益，下文將重點(diǎn)分析。關(guān)于如何改造可以進(jìn)一步咨詢我們的工程師。主體工程由每組集體型真空管太陽能熱水器陣列及支架、不銹鋼儲(chǔ)熱水箱、水箱架及底座、溫差循環(huán)裝置、自動(dòng)補(bǔ)冷水裝置等組成；輔助加熱設(shè)備可由電加熱設(shè)備或燃油鍋爐或燃?xì)忮仩t組成。具體采用哪一種或哪幾種方法防凍，要根據(jù)用戶的實(shí)際情況并結(jié)合用戶用水要求來確定。為了充分利用太陽能減少熱損失，所有管道采用50㎜巖棉管或聚氨酯發(fā)泡保溫，㎜厚鋁板包裝，外表美觀，并起防水作用；中間連接器采用日本進(jìn)口SUS3042B不銹鋼板制作，采用厚度為50mm的聚氨酯發(fā)泡保溫。故冬季每平方太陽能功率大于2kw/㎡據(jù)每平方太陽能熱水器在夏季晴天狀態(tài)下可使120㎏冷水升溫到60℃以上。Lesson61 Trouble with the Hubble 哈勃望遠(yuǎn)鏡的困境Your sister will be here in less than an hour and we must be at the station to meet her. We are late already.39。A relation of yours is ing to see you. She will be arriving this evening and intends to stay for a few days. The moment you leave this tent, you will get a big surprise. A woman you know well will rush towards you. She will speak to you and then she will lead you away from this place. That is all.39。Lesson59 In or out ？ 進(jìn)來還是出去？. Because the tree was mentioned in a newspaper, the number of visitors to Frinley has now increased. The tree was planted near a church fifty years ago, but it is only in recent years that it has gained an evil reputation. It is said that if anyone touches the tree, he will have bad luck。Dreams of finding lost treasure almost came true recently. A new machine called 39。After breakfast, I sent the children to school and then I went to market. It was still early when I returned home. The children were at school, my husband was at work and the house was quiet. So I decided to make some tarts for tea. In a short time I was busy mixing butter and flour and my hands were soon covered with sticky pastry. At exactly that moment, the telephone rang. Nothing could have been more annoying. I picked up the receiver between two sticky fingers and was dismayed when I recognized the voice of Mrs Bates. It took me ten minutes to persuade her to ring back later. At last I hung up the receiver. What a mess! There was pastry on my fingers, on the telephone, and on the doorknobs. I had no sooner got back to the kitchen than the doorbell rang loud enough to wake the dead. This time it was the postman and he wanted me to sign for a registered letter !At last firemen have put out a big forest fire in California. Since then, they have been trying to find out how the fire began. Forest fire are often caused by broken glass or by cigarette ends which people carelessly throw away. Yesterday the firemen examined the ground carefully, but were not able to find any broken glass. They were also quite sure that a cigarette end did not start the fire. This morning, however, a fireman accidentally discovered the cause. He noticed the remains of a snake which was wound round the electric wires of a 16,000volt power line. In this way, he was able to solve the mystery. The explanation was simple but very unusual. A bird had snatched up the snake from the ground and then dropped it on to the wires. The snake then wound itself round the wires. When it did so, it sent sparks down to the ground and these immediately started a fire. This is the prettiest carpet I have ever seen,39。We are going back now,39。 I said. 39。 I forgot to put you off.39。 Is this Woodford Green ?39。ll have to get off here,39。I sat in the front of the bus to get a good view of the countryside. After some time, the bus stopped. Looking round, I realized with a shock that I was the only passenger left on the bus. 39。m going to Woodford Green,39。I love travelling in the country, but I don39。 had put it on the floor, he promptly went to sleep again.When a plane from London arrived at Sydney airport, workers began to unload a number of wooden boxes which contained clothing. No one could account for the fact that one of the boxes was extremely heavy. It suddenly occurred to one of the workers to open up the box. He was astonished at what he found. A man was lying in the box on top of a pile of woollen goods. He was so surprised at being discovered that he did not even try to run away. After he was arrested, the man admitted hiding in the box before the plane left London. He had had a long and unfortable trip, for he had been confined to the wooden box for over ten hours. The man was ordered to pay amp。 Only 25 per cent a thief now!39。The whole village soon learnt that a large sum of money had been lost. Sam Benton, the local butcher, had lost his wallet while taking his savings to the postoffice. Sam was sure that the wallet must have been found by one of the villagers, but it was not returned to him. Three months passed, and then one morning, Sam found his wallet outside his front door. It had been wrapped up in newspaper and it contained half the money he had lost, together with a note which said: 39。The strap needsFiremen had been fighting the forest fire for nearly three weeks before they could get it under control. A short time before, great trees had covered the countryside for miles around. Now, smoke still rose up from the warm前 言太陽能產(chǎn)品分兩大類：太陽能光電產(chǎn)品和太陽能光熱產(chǎn)品，而太陽能熱水器是太陽能光熱產(chǎn)品中的一種，也是目前太陽能產(chǎn)品中技術(shù)最成熟 、應(yīng)用最廣泛的一種，具有環(huán)保節(jié)能和安全方便的特點(diǎn)。clock this evening. By that time, the Astra will have been flying through space for seventeen hours and will have circled the earth a great many times. When the first radio messages have been received, the results of the trip will be announced immediately.Where have you been hiding ?39。Lesson60 The future 卜算未來The tiny village of Frinley is said to possess a 39。 has been invented and it has been used to detect gold which has been buried in the ground. The machine was used in a cave near the seashore whereit is saidpirates used to hide gold. The pirates would often bury gold in the cave and then fail to collect it. Armed with the new machine, a search party went he did not like it. She enjoyed herself making the assistant bring almost everything in the window before finally buying the dress she had first asked for.You don39。Lesson52 A pretty carpet 漂亮的地毯Lesson51 Reward for virtue 對(duì)美德的獎(jiǎng)賞Well, in that case, I prefer to stay on the bus,39。ll get off here.39。It doesn39。Oh dear,39。Th