This paper discusses detailedly the waterproof characteristic of coal ash, and the proportion and influence factor considering in construction.
本文详细论述了粉煤灰的防水特性，在施工中应考虑的配合比及其影响因素。
Objective: to study the clinical characteristic and Risk factor in sudden-onset fatal asthma (SFA).
目的：探讨突发性致死性哮喘sfa的临床特点及其危险因素。
In this dissertation, the changing characteristic and trend and its influential factor of wheat supply and demand in China are analyzed.
本文从供给和需求两个角度，描述我国小麦供需均衡的现状及变化特点，分析供给与需求变化的影响因素。
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