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学校课外活动的基本组织形式是（）。
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连续监测法测定酶活力浓度时，反应体系中温度变化应控制在（）
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安装（回撤）机电综合管理中规定职工按计划培训、必须持证上岗，机电职工要有（）轮训规划。
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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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供电企业内部人员需借阅客户档案，应说明借阅原因，并完整记录借阅时间、借阅客户档案名称、客户户号、内容、数量等情况并签字确认；借阅时间一般不超过（）个工作日。
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某土样的天然含水量叫为25%，液限ω为40%，塑限ωp为15%，其液性指数I为：（）
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下列哪项提示胎儿宫内窘迫
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璃样变性，下述哪项是错误的（）
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下列哪一种表现符合中枢性呼吸衰竭（）
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上锁销为什么要进行复位试验？怎样进行？有什么影响？