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某房地产开发公司(以下简称A公司)在某市商业街开发了一幢商品楼，售价4000元/m2。甲某选中了其中一套三居室，双方签订了购房合同并于2004年2月1日办理了付款交房的手续，并且约定1年之内办理所有权证书。 甲某因公需要出国1年，为了方便房屋的维护，甲某在2004年2月18日将房屋钥匙交给A公司下属的物业处保管。3月份以后，该市的楼价大幅上涨，商品房供不应求。3月5日。A公司售楼人员乙某从物业处取走了甲某房屋钥匙，打开房门让购房者参观选购。该房屋被丙某看中，乙某以A公司名义与丙某签订了购房合同，双方于3月30日办理了交房付款手续，并于次日办理了过户登记手续。甲某于2005年5月回国后发现本属于自己的房屋已被他人居住，十分气愤，手持购房合同要求丙某腾退房屋，遭到丙某拒绝。甲某找到A公司交涉，A公司负责人表示“一房二卖”的确是自己的工作人员所为，向甲某道歉并表示愿意按照合同约定返还甲某的全部购房款及利息，但拒绝甲某要求返还房屋的请求。 根据上述案例，请回答： A公司与丙某的购房合同是否有效为什么
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牙关紧闭及角弓反张是何种细菌感染所致
2003年11月9日，L省D县亚太公司与河北省乙县北美公司签订了一份《钢板购销合同》，合同约定由亚太公司向北美公司供应1000吨优质钢板，北美公司在货到后付款。亚太公司依约于2003年12月21日将货全部发给了北美公司，但北美公司收到钢板后屡次拖延付款。亚太公司后来派人直接到北美公司要货款，发现北美公司原来是一家频临倒闭的公司，已没有什么财产。北美公司的总经理也称自己公司已没有任何财产，不能偿还亚太公司的货款。后来亚太公司在H市的业务友好单位北欧公司告诉亚太公司，北美公司在H市丙区有一批即将出售的钢板，约750吨，亚太公司遂准备申请诉前财产保全。 如果亚太公司在人民法院采取保全措施后5日内不起诉，人民法院应当如何处理北美公司若因亚太公司在法定期间内没有起诉而遭受了财产损失，如15日后钢板价格暴跌，北美公司应向哪个人民法院起诉，要求亚太公司赔偿损失
4Engineering students are supposed to be examples of practicality and rationality, but when it comes to my college education, I am an idealist and a fool. In high school I wanted to be an electrical engineer and, of course, any sensible student with my aims would have chosen a college with a large engineering department, famous reputation and lot of good labs and research equipment. But that’s not what I did.I chose to study engineering at a smalI liberal-arts university that doesn’t even offer a major in electrical engineering. Obviously, this was not a practical choice; I came here for more noble reasons. I Wanted a broad education that would provide me with flexibility and a value system to guide me in my career. I wanted to open my eyes and expand my vision by interacting with people who weren’t studying science or engineering. My parents, teachers and other adults praised me for such a sensible choice. They told me I was wise and mature beyond my 18 years, and I believed them.I headed off to college, feeling sure I was going to have an advantage over those students who went to big engineering "factories" where they didn’t care if you had values or were flexible. I was going to be a complete engineer., technical genius and sensitive hu manist all in one.Now I’m not so sure. Somewhere along the way my noble ideals crashed into reality, as all noble ideals eventually do. After three years of struggling to balance math, physics and engineering courses with liberal arts courses, I have learned there are reasons why few engineering students try to reconcile engineering with liberal arts courses in college.The reality that has blocked my path to become the typical successful student is that engineering and the liberal arts simply don’t mix as easily as I assumed in high school. Individually they shape a person in very different ways; together they threaten to confuse. The struggle to reconcile the two fields of study is difficult. The author’s experience shows that he was （）.
3Kevin Rogers used to be my boss. At that time he was a hard-working, up-and-coming businessman and a real slave-driver, always telling us we had to sell more and more. As soon as I could, I got a job with another company. The last time I saw Rogers was more than ten years ago. At least that’s what I thought until last Thursday. But now I’m not so sure.I was on my way back to my office in the center of town. There is a small park nearby which I sometimes walk through after lunch. It is empty, except for an unshaven, shabby looking man on one of the benches. He looked about fifty years old and was wearing an old, gray overcoat. It was a cold, wintry day, and he was shivering."It’s been a long time since I had a meal. Can you help me" he said. There was some thing about his voice that sounded familiar. I gave him a few coins and he mumbled some thing about being grateful. As he stumbled past me, I looked at his face closely. I won dered where I had seen him before. Then it hit me. Could it possibly be... No! Impossible, I thought. I watched him walking away. He was the same height as Rogers but looked a lot thinner than I remembered. Then, as he left the park and turned down the street, I caught sight of his face again, this time in profile. The nose was the same as Rogers’, too. I al most followed him but something made me stop. I just couldn’t be sure. But the resem- blance was very close.Yesterday I ran into someone who had worked for Rogers at the same time I did, and had stayed on longer. I started telling him about the man I had seen in the park. For a mo ment I thought it was our old boss. The voice, the nose, and even the face were just like Rogers, but it couldn’t have been. "Rogers must be the director of a big company by now," I said.My ex-colleague shook his head. "I thought you knew. ""Knew Knew what What are you talking about""Rogers was sent to prison six years ago. He’s probably out by now. For all I know he’s sleeping on park benches and begging money from passers-by. \ It seems that when Rogers was the writer’s boss, the writer （）.
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