《GB 5906-1997 尘肺的X线诊断》与前一版《GB 5906-1986》相比,主要在以下几个方面进行了修订和更新: 诊断标准细化:1997版标准对尘肺病的X线诊断分类和分期进行了更为细致的划分,增加了诊断的准确性和精确度。它不仅考虑了小阴影的分布、形态、密集度等多方面特征,还对大阴影的出现、范围以及其与小阴影的关系给...
摘要: 缩短GB6432—86测饲料粗蛋白质消化时间的试验报告张洁姚祖碧消化的彻底与否直接影响饲料粗蛋白质测定结果的准确性.消化是在催化剂帮助下,用硫酸破坏饲料中有机物质,使含氮物转化成硫酸铵,而非含氮物则以CO2↑+H2O↑+SO2↑状态逸出.完成该过程需...关键词:...
However, most photopolymerizations employ a combination of photochemically labile molecules as sensitizers and initiators, which are inevitably covalently incorporated into the polymer products as end groups, with unknown infuences on the mechanical, biological, and environmental properties. Therefore, it ...