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参考答案：是由中央教育行政机构编制和审定的课程，其管理权属中央级教育机关，是一级课程。

单项选择题

A manufacturing project has a schedule performance index(SPI)of 0.89 and a cost performance index(CPI)of 0.91．Generally，what is the BEST explanation for why this occurred ？（）

A．The scope was changed

B．A supplier went out of business and a new one needed to be found

C．Additional equipment needed to be purchased

D．A critical path activity took longer and needed more labor hours to complete
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