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下列调查措施中，具有保全性质的是？（）
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对“婚姻理由”的咨询要点，有什么？
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项目成本管理又叫项目价值管理。()
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现代饭店的基本特征是什么？
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模块型接线子接续规定：接续配线电缆芯线时，模块下层接用户端线，上层接局端线；接续中继电缆芯线时，模块下层接B端线，上层接A端线；接续不同线径芯线时，模块下层接粗线径线，上层接细线径线。
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《国民经济和社会发展第十一个五年规划纲要》指出：坚持公有制为主体、多种所有制经济共同发展的基本经济制度。发挥国有经济的主导作用。大力发展个体、私营等非公有制经济，鼓励和支持非公有制经济参与国有企业改革，进入金融服务业、公用事业、基础设施等领域。我国为什么要实行公有制为主体、多种所有制经济共同发展的基本经济制度？
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圆锥角是指在通过圆锥轴线的截面内，______的夹角。圆锥配合的形成可以分为下列两种形成方式：______圆锥配合和______圆锥配合。
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生物氧化是氧化还原过程，在此过程中有（）、（）和（）三种成份参与。
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根据材料，完成题。 Fitness Movement The fitness movement that began in the late 1960s and early 1970s centered around aerobic exercise.Millions of individuals became engaged in a variety of aerobic activities, and51thousands of health spas developed around the country to capitalize on his52interest in fitness, particularly aerobic dancing for females. A number of fitness spas existed53to this aerobic fitness movement, even a national chain with spas in most major cities. However, their54was not on aerobics, but rather on weight-training programsdesigned to develop muscular mass, 55, and endurance in their primarily male56. These fitness spas did not seem to benefit57from the aerobic fitness movement to better health, since medical opinion suggested that weight-training programs58few, if any, health benefits. In recent years, however, weight training has again become increasingly. 59for males and for females. Many60programs focus not only on developing muscular strength and endurance but on aerobic fitness as well.61, most physical fitness tests have usually included measures of muscular strength and endurance, not for health related reasons, butprimarily62such fitness components have been related to performance in athletics.63, in recent years,evidence has shown that training programs designed primarily to improve muscular strength and endurance might also offer some health64as well. The American College of Sports Medicine now65that weight training be part of a total fitness program for healthy Americans.请在第__(51)__处填上正确答案。
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热风炉的燃烧期主要是辐射传热。（）