需要30万吨谷类补充库存。Three hundred thousand tons of cereals are needed to replenish stocks.该保险公司将接受仓库库存货物或长期国库券作为担保。The insurance company will take warehouse stocks or treasury bonds as surety.弹药的库存正在减少。Stocks of ammunition were...
In this paper, a discrete stage - structured epidemical model is proposed and studied.本文主要讨论了离散的阶段结构传染病模型.OBJECTIVE To explore the administration measures of air condition usage in SARS epidemical period.目的研究传染性非典型肺炎流行期间...