天气预报 > 其他 > 台灯一般有多少厘米
台灯一般有多少厘米
更新时间: 2020-11-03 00:00:00  

30厘米左右。因为眼睛距离书本30厘米时,既能看清字迹,也不会过度疲劳,以此推算,台灯的高度距离书面30厘米比较合适,这样既保证充足的阅读照明,周围的环境也有一定的亮度。如果台灯太低,则会使光线照到过小的范围内,而周围则一片漆黑,失去了可供远望的参照物。

关键词: 台灯 一般 多少 厘米

台灯一般有多少厘米相关经验

天气预报

最新推荐

页面:/news/view-1749519/ | 耗时:0.3463 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=1749519 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1749519 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1749519 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1130314,1068524,1074712,1085850,1133371,2901477,1073678,1069889,1125148,1065391,1066134,1068220,1107997,1101413,1112004,1054366,1115305,1084603,1303472,1062296,3188361,112432,1078735,1132027,1110574,1062450,1070534,2702389,1491356,1132565) ORDER BY field (ArticleID,1130314,1068524,1074712,1085850,1133371,2901477,1073678,1069889,1125148,1065391,1066134,1068220,1107997,1101413,1112004,1054366,1115305,1084603,1303472,1062296,3188361,112432,1078735,1132027,1110574,1062450,1070534,2702389,1491356,1132565)