题目内容
（请给出正确答案）
[单选题]
I’veheardan()thatMyflighthasbeendelayed、Couldyoutellmewhy.
A.idea
B.information
C.advices
D.announcement
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.idea
B.information
C.advices
D.announcement
如果结果不匹配，请 联系老师 获取答案
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B.(P/F，i，n)=(A./F，i，n)×(P/A.，i，n)
C.(P/F，i，n)=(P/F，i，n1)×(A./F，i，n2)(n1+n2=n)
D.(A./P，i，n)=(F/P，i，n)×(A./F，i，n)
E.(A./F，i，n)=(P/F，i，n)×(A./P.i，n)
