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...
请你邮寄这个小包裹算是利用你 吗 ?Would it be an imposition to ask you to mail this parcel?请你替我把这个小包裹捆一下好 吗 ?Will you do up this parcel for me?几个青年妇女把掉在水里又捞出来的小包裹,丢给了他们.The women rescued their bundles which had fallen into the water and...
Vowels have something to do with glottal closure, therefore influencs acoustical measures.结论:元音不同,声门闭合度存在差异, 进而影响声学测试的参数.The glottal stop and uvular & quot ; r & quot ; and & quot ; ch & quot ; in German & quot ; bach & ...
控释肥CAU3144F、COMPO对雏菊、矮牵牛 、 三色堇的应用效果显著.CRF of CAU 3144 F was the most optimal for petunia, COMPO for pansy and daisy respectively.三色堇是我国冬春常用的草本花卉,在我国广泛栽培.Pansy Viola wittrockiana is an important ornamental plant used in t...