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符合该患者ECG表现是（） 该患者发生下肢水肿的机制是（）
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依行政主体立法的来源不同，可以划分为：（）
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关于十二指肠的叙述，错误的是（）
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YPX3-280M_4型异步旋转劈相机的额定电压是（）。
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抵押财产价值减少的，抵押权人没有什么权利？（）
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当股票的市场价格一旦上升到某一个位置时，投资者Ａ就会卖掉它，这是因为A设定了一个心理账户。
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下列化合物中不能发生加聚反应的是：（）
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接近车站、鸣笛标、曲线、道口、桥梁、隧道、行人和施工地点，黄色信号、引导信号、容许信号或天气不良时，机车的鸣笛方式为（）。
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回答题Human needs seem endless．They might be regarded as making up several levels．When there is enough money to satisfy one level of needs, another level appears．The first and most basic level of needs involves food．Once this level is satisfied, the second level of needs, clothing and some sort of shelter, appears．By the end of World War Ⅱ , these needs were satisfied for a great majority of Americans．Then a third level appeared．It included such items as automobiles and new houses．By 1957 or 1958 this third level of needs was fairly well satisfied．Then, in the late 1950s, a fourth level of needs appeared: the "life-enriching level．While the other levels involve physical satisfaction, that is, the feeding, comfort, safety, and transportation, this level stresses mental needs for recognition, achievement, and happiness．It includes a variety of goods and services．Among them are vacation trips, the best medical and dental care, and recreation．Also included here are fancy goods and the latest styles in clothing．On the fourth level, a lot of money is spent on services, while on the first three levels more isspent on goods．A fifth level would probably involve needs that can be achieved best by community action．Consumers may be spending more on taxes to pay for government action against disease, ignorance, crime, and prejudice．After filling our stomachs, our clothes closets, our garages, our teeth, and our minds, we now may seek to ensure the health, safety, and leisure to enjoy more fully the good things on the first four levels．According to the passage, man will begin to think about such needs as housing and clothing only when________
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某控件在程序运行后，在窗体中没有出现，是因为该控件的______属性设置为False