会计电算化是一个总体性概念。所谓“总体”是指会计电算化的应用范围应当是全社会的会计工作，即所有会计单位基本上都实现了应用电子计算机信息技术进行会计核算、管理工作。 ()
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How did the researchers carry out their study？
A. They studied the findings of several previous research projects.
B. They conduced a questionnaire with 411 pilots.
C. They collected data from the database at the Johns Hopkins University.
D. They analyzed the circumstances of the crashes involved.
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