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【简答题】
A cosmetics company had a staff of 3,000 at the beginning of 20X1 and, owing to a series of redundancies caused by the recession, 2,000 at the end of the year. Voluntary redundancy was taken by 1,500 staff at the end of June, 500 more than the company had anticipated, and these excess redundancies were immediately replaced by new joiners. What is the labour turnover rate?
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【简答题】A．P(S3)和P(S4) B．P(S3)和V(S4) C．V(S3)和V(S4) D．V(S3)和P(S4)
【单选题】已知等比数列{a n }的公比q＜0，前n项的和为S n ，则S 4 a 5 与S 5 a 4 的大小关系是 [ ]
A.
S 4 a 5 =S 5 a 4
B.
S 4 a 5 ＞S 5 a 4
C.
S 4 a 5 ＜S 5 a 4
D.
不能确定
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