天气预报 > 其他 > 洁净度是如何分级的标准是什么
洁净度是如何分级的标准是什么
更新时间: 2020-10-28 00:00:00  

洁净度的分级标准是按照空气中含尘浓度划定的,空气中含尘浓度低则空气洁净度高,含尘浓度高则空气洁净度低,以每立方米空气中的最大允许粒子数来确定其空气洁净度等级。

空气洁净度等级(aircleanlinessclass)是洁净空间单位体积空气中,以大于或等于被考虑粒径的粒子最大浓度限值进行划分的等级标准。

关键词: 洁净 如何 分级 标准 什么

洁净度是如何分级的标准是什么相关经验

天气预报

最新推荐

页面:/news/view-1754543/ | 耗时:0.1620 s | 内存:2.11 MB | 查询:4 | 缓存读取:3 写入:0 | 加载文件:25
select * from tbl_Articles WHERE ArticleID=1754543 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1754543 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1754543 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1056798,1071041,1074312,1047767,1073218,1064345,1125231,1062566,1054832,992503,1054674,1057383,1055307,1123112,1094015,1067933,1090232,1124433,1055149,1052347,1072679,1106711,1064613,1042893,1065727,1131227,996794,1041271,1065741,1131699) ORDER BY field (ArticleID,1056798,1071041,1074312,1047767,1073218,1064345,1125231,1062566,1054832,992503,1054674,1057383,1055307,1123112,1094015,1067933,1090232,1124433,1055149,1052347,1072679,1106711,1064613,1042893,1065727,1131227,996794,1041271,1065741,1131699)