目的研究幽门螺杆菌（HP）感染与胃癌前期变化的关系。
Objective To investigate the relationship between HP (helicobacter pylori) infection and gastric precancerous lesion.
蔗糖含量采收前期变化平稳，采收中后期蔗糖含量上升明显；
The content of sucrose kept a stable level during the early stage, then increased rapidly;
建立了在可变提前期下允许缺货和产品有损耗的最优化库存模型，提出了损耗率是随着提前期变化的规律。
Optimal inventory model with variable lead time, shortage and deteriorating items is discussed, the rule of deteriorating rate changing with lead time is taken.
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