信贷业务档案保管期限是指信用项目到期后，该项目档案的保存时间。个人客户信贷档案自贷款结清之日起保管五年。
参考答案：错
201. Tom _____ into the house when no one .
A．slipped; was noticing
B．had slipped; noticed
C．slipped; had noticed
D．was slipping; noticed
证明：xn+xn-1+…+x=1(n＞1)在(0，1)内必有唯一实根xn，并求
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