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社会保障水平的计算公式:社会保障水平=社会保障支出总额÷国内生产总值×100%。 ()

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The forty years from the 1930s to the 1970s was an important period

A. in the development of air transportation
B. the earliest passenger flights were successfully operated
C. to make travel easy and pleasant for the passengers
D. to provide different services
E. the shortage of qualified pilots
F. traveling by air was very cheap

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社会保障水平的计算公式:社会保障水平=社会保障支出总额÷国内生产总值×100%。 ()

社会保障的核心内容是社会救助。()参考答案：错误

政府干预理论是凯恩斯就业理论和经济学说的核心。()参考答案：错误

工伤保险实行个人不缴费原则。()

The forty years from the 1930s to the 1970s was an important period

社会保障的核心内容是社会救助。()
参考答案：错误

政府干预理论是凯恩斯就业理论和经济学说的核心。()
参考答案：错误