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中文摘要：
经典占线赁购决策是建立在设备使用寿命无限大的假设下进行竞争策略分析，是一种单阶段的占线决策问题。论文把设备使用寿命因素考虑进占线赁购问题，扩展单阶段占线赁购问题为多阶段占线赁购。给出了该问题的离线解；设计了等长赁购策略，证明该策略是唯一最优策略；给出了风险策略基本性质，为进一步研究多阶段占线赁购风险补偿模型奠定了基础。
英文摘要：
Based on the single stage leasing problem, we present the multistage leasing problem （MLP） in the paper. The techniques to solve the off-line MLP are firstly discussed, and then the equal interval leasing strategy （EILS） for the on-line MLP is also proposed. We prove that the EILS is the unique optimum leasing strategy for MLP. Moreover, we analyze some desired properties for risk leasing strategy, which can be used as a base to construct risk-reward model for the MLP. The results in this paper are helpful for enriching the researches on the online leasing problem.
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