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论述合同保全与合同担保的区别。
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“重几千斤的大象因为从小养成的思维定式的束缚,致使一根细小的铁链就能将其困住”的故事,意在说明()的重要性。
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康明斯发电车冷却风机自动位时,若出现冷却风机自动启动后无法自动停止,这一故障最大可能性是()。
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滑停过程中,蒸汽降温速度不大于(),蒸汽过热度不低于(),汽包壁温差不大于()。
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无脑儿的超声诊断要点正确的是()。
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永乐大典
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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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窦性心律不齐指同一导联心电图上P-P间期相差()
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投资规模
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包装危险货物装卸时,对可能存在危险气体的货舱进行()。