【導(dǎo)讀】信息和材料、能源一樣成為一種社會(huì)的基本生產(chǎn)資料，在人類(lèi)。的社會(huì)生產(chǎn)活動(dòng)中發(fā)揮著重要的作用。同時(shí)人們對(duì)信息和數(shù)據(jù)的利用?？?，可以提高工作效率；對(duì)外來(lái)看，獲得競(jìng)爭(zhēng)優(yōu)勢(shì)。生命周期法是20世紀(jì)60年代發(fā)。系統(tǒng)快速生成工具，建立一個(gè)系統(tǒng)模型，再在此基礎(chǔ)上與用戶(hù)交流，比較滿(mǎn)意為止，從而形成一個(gè)相對(duì)穩(wěn)定、較為理想的管理信息系統(tǒng)；法的特點(diǎn)是以對(duì)象為基礎(chǔ)，對(duì)象是分析問(wèn)題和解決問(wèn)題的核心。的，而系統(tǒng)實(shí)現(xiàn)等步驟則采用了原型法和面對(duì)對(duì)象的方法。系統(tǒng)開(kāi)發(fā)成功的保證，而且可以提高效率、節(jié)省時(shí)間、降低成本。在這種形勢(shì)下，書(shū)籍就漸漸地成為人們獲取并增長(zhǎng)。了在Visual環(huán)境下采用“自上而下地總體規(guī)劃，圖書(shū)管理、借閱、瀏覽、VisualBasic，第一章．開(kāi)發(fā)本系統(tǒng)的目的及意義？

　　

【正文】 im: He felt ashamed of himself as the tears stung his eyes. The owl had been his panion, his one great link w ith the magical world whenever he had been forced to return to the Dursleys. Hagrid reached out a great hand and patted him painfully on the shoulder. “ Never mind,” he said gruffly, “Never mind. She had a great old life – ” “ Hagrid!” said Ted Tonks warningly, as the hairbrush glowed bright blue, and Hagrid only just got his forefinger to it in time. With a jerk behind the navel as though an invisible hook and line had dragged him forward, Harry was pulled into nothingness, spinning uncontrollably, his finger glued to the Portkey as he and Hagrid hurtled away from Mr. Tonks. Second later, Harry?s feet slammed onto hard ground and he fell onto his hands and knees in the yard of the Burrow. He heard screams. Throwing aside the no longer glow ing hairbrush, Harry stood up, swaying slightly, and saw Mrs. Weasley and Ginny running down the steps by the back door as Hagrid, who had also collapsed on landing, clambered “ The Death Eaters were waiting for us,” Harry told her, “We were surrounded the moment we took off – they knew it was tonight – I don?t know what happened to anyone else, four of them chased us, it was all we could do to get away, and then Voldemort caught up with us – ” He could hear the selfjustifying note in his voice, the plea for her to understand why he did not know what had happened to her sons, but – “ Thank goodness you?re all right,” she said, pulling him into a hug he did not feel he deserved. “ Haven?t go? any brandy, have yeh, Molly?” asked Hagrid a little shakily, “Fer medicinal purposes?” She could have summoned it by magic, but as she hurried back toward the crooked house, Harry knew that she wanted to hide her face. He turned to Ginny and she answered his unspoken plea for information at once. “ Ron and Tonks should have been back first, but they missed their Portkey, it came back without them,” she said, pointing at a rusty oil can lying on the ground nearby. “And that one,” she pointed at an ancient sneaker, “should have been Dad and Fred?s, they were supposed to be second. You and Hagrid were third and,” she checked her watch, “if they made it, Gee and Lupin aught to be bac k in about a minute.” Mrs. Weasley reappeared carrying a bottle of brandy, which she handed to Hagrid. He uncorked it and drank it straight down in one. A blue light had appeared in the dar kness: It grew larger and brighter, and Lupin and Gee appeared, spinning and then falling. Harry knew immediately that there was something wrong: Lupin was supporting Gee, who was unconscious and whose face was covered in blood. Harry ran forward and seized Gee?s legs. Together, he and Lupin carried Gee into the house and through the kitchen to the living room, where they laid him on the sofa. A s the lamplight fell across Gee?s head, Ginny gasped and Harry?s stomach lurched: One of Gee?s ears was missing. The side of his head and neck were drenched in wet, shockingly scarlet blood. No sooner had Mrs. Weasley bent over her son that Lupin grabbed Harry by the upper arm and dragged him, none too gently, back into the kitchen, where Hagrid was still attempting to ease his “ So why aren? you checkin? me?” panted Hagrid, still struggling with the door. “ You?re halfgiant,” said Lupin, looking up at Hagrid. “The Polyjuice Potion is designed for human use only.” “ None of the Order would have told Voldemort we were moving tonight,” said Harry. The idea was dreadful to him, he could not believe it of any of them. “Voldemort only caught up with me toward the end, he didn?t know which one I was in the beginning. If he’ d been in on the plan he?d have known from the start I was the one with Hagrid.” “ Voldemort caught up with you?” said Lupin sharply. “What happened? How did you escape?” Harry explained how the Death Eaters pursuing them had seemed to recognize him as the true Harry, how they had abandoned the chase, how they must have summoned Voldemort, who had appeared just before he and Hagrid had reached the sanctuary of Tonks?s parents. “ They recognized you? But how? What had you done?” “ I…” Harry tried to remember。 the whole journey seemed like a blur of panic and confusion. “I saw Stan Shunpike…. You know, th e bloke who was the conductor on the Knight Bus? And I tried to D isarm him instead of – well, he doesn?t know what he?s doing, does he? He must be Imperiused!” Lupin looked aghast. “ Harry, the time for Disarming is past! These people are trying to capture and kill you! At least Stun if you aren?t prepared to kill!” “ We were hundreds of feet up! Stan?s not himself, and if I Stunned him and he?d fallen, he?d have died the same as if I?d used Avada Kedavra! Expelliarmus saved me from Voldemort two years ago,” Harry added defiantly. Lupin was reminding him of the sneering Hufflepuff Zacharias Smith, who had jeered at Harry for wanting to teach Dumbledore?s Army how to Disarm. “ Yes, Harry,” said Lupin with painful restraint, “and a great number of Death Eaters witnessed that happening! Five me, but it was a very unusual move then, under the imminent threat of death. Repeating it tonight in front of Death Eaters who either witnessed or heard about the first occasion was close to suicidal!” “ So you think I should have killed Stan Shunpike?” said Harry angrily. “ Of course not,” said Lupin, “but the Death Eaters – frankly, most people! – would have expected you to attack back! Expelliarmus is a useful spell, Harry, but the Death Eaters seem to think it is your signature move, and I urge you not to let it bee so!” Lupin was making Harry feel idiotic, and yet there was still a grain of defiance inside him. “ I won?t blast people out of my way just because they?re there,” said Harry, “That?s Voldemort?s job.” Lupin