天气预报15天查询> 教育> 小学生用HB还是2B铅笔好

小学生用HB还是2B铅笔好

更新时间: 2021-05-24 22:12:41     

1、小学生用HB的铅笔好。

2、H类铅笔,笔芯硬度相对较高,适合用于界面相对较硬或粗糙的物体,比如木工划线,机械制图等;HB类铅笔笔芯硬度适中,适合一般情况下的书写(写字);B类铅笔,笔芯相对较软,适合绘画(尤其是素描),其中2B铅笔被用于填涂一些机器可识别的卡片,如答题卡。

关键词: 小学生 hb 还是 2b 铅笔

如有意见、反馈、侵权或投诉等情况,请联系:

电话:
邮箱:

我们将会在48小时内给与处理!

版权所有 Copyright ? 2009-2020 tianqiyubao3.com

页面:/news/view-447165/ | 耗时:0.4201 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=447165 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=447165 LIMIT 0,1
select * from tbl_Articles_sphinx where id=447165 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1121778,769734,477835,853855,901342,1307702,431259,607765,898516,407048,824649,650396,493527,805941,507804,1716786,722074,861101,418505,921764,556391,422529,2117036,705519,1109948,839147,579243,616263,815812,587731) ORDER BY field (ArticleID,1121778,769734,477835,853855,901342,1307702,431259,607765,898516,407048,824649,650396,493527,805941,507804,1716786,722074,861101,418505,921764,556391,422529,2117036,705519,1109948,839147,579243,616263,815812,587731)