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了解胎盘功能最常用而简便的方法是
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某建设项目的净现金流量如下表所示，则该项目的静态投资回收期为( )年。 现金流量表 (单位：万元) 年份 1 2 3 4 5 净现金流量 -200 80 40 60 80
Your’’re off work and hanging out at home. Off your diet and into cookies, big dinners and champagne. Off your schedule, and up nights with movies, videos or a good book. Off your workout routine and skipping your morning swim or evening run. In short, you’’re off, free of responsibilities and pressure, stuffed full of food and fun. And you don’’t like it. "All humans, and for that matter all species that are vertebrates and many that are not, have internal clock mechanism, "said George Brainard, professor of neurology at Thomas Jefferson University in Philadelphia." That’’s not a metaphor. It’’s an actual biological entity." As many people find themselves in the second week of enforced indolence because of the winter break -- whether because of school holidays or time off from work -- more than a few may be experiencing a peculiar sensation. A wave of discontent at the luxury of doing nothing, of sitting around with time to spare, the commodity of the late 20th century that we’’re constantly told is in dangerously short supply. The sense is that you should feel great, but actually you don’’t. You hate to admit it, but it might even be a welcome break to go back to work or school. "I enjoy being off, but I enjoy coming back too, "said Virgina Woodard of Chicago. After several days off around Christmas, she was back at her baby-sitting job on New Year’’s Eve, taking her 3-year-old charge to a museum. "It messes up your schedule, and coming back is tiresome," said Woodard, who nonetheless said she enjoyed her time off. "I feel like I’’ll need a week to recover to get back on my schedule, "said Joni Lederer. She and her family shared the holidays at their Highland Park home with another family, and she has spent the days since taking her two sons skating ,bowling and to museums. "Most people," said Brainard," do better and are healthier if they keep a regular social calendar to their life that is somewhat consistent with their internal timekeeping mechanism." The changes in routine that commonly occur during the holidays come at a biological cost. Those changes disrupt the body clock, located primarily in the brain, and may produce an out-of-sorts feeling. "Normal day-to-day routines and realities are very supportive of the internal clock structure that leads to good health," he added. Which of the following concerning the internal clock structure is NOT true
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广西某家工厂因产品在国内十分畅销，欲投资建设新厂，将该产品销往国外。该工厂为了编制投资计划，进行各种施工准备，确定设备供应指标、加工订货及落实各项技术经济责任制，编制了工程设计概算。经过审查批准的工程设计概算，是控制工程建设投资的最高限额。 根据以上内容，回答下列问题： 工程设计概算的编制依据有哪些
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