铅笔上不同的标记:4B,2B,2H和4H,都有何不同?在一般的纸上写字,试用各种铅笔依次书写,用4B和4H,效果有何不同呢?从对所有铅笔的比较中,请说明为何多数人在一般的纸上写字要使用HB铅笔而不
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![铅笔上不同的标记:4B,2B,2H和4H,都有何不同?在一般的纸上写字,试用各种铅笔依次书写,用4B和4H,效果有何不同呢?从对所有铅笔的比较中,请说明为何多数人在一般的纸上写字要使用HB铅笔而不](/uploads/image/z/1802154-66-4.jpg?t=%E9%93%85%E7%AC%94%E4%B8%8A%E4%B8%8D%E5%90%8C%E7%9A%84%E6%A0%87%E8%AE%B0%EF%BC%9A4B%2C2B%2C2H%E5%92%8C4H%2C%E9%83%BD%E6%9C%89%E4%BD%95%E4%B8%8D%E5%90%8C%3F%E5%9C%A8%E4%B8%80%E8%88%AC%E7%9A%84%E7%BA%B8%E4%B8%8A%E5%86%99%E5%AD%97%2C%E8%AF%95%E7%94%A8%E5%90%84%E7%A7%8D%E9%93%85%E7%AC%94%E4%BE%9D%E6%AC%A1%E4%B9%A6%E5%86%99%2C%E7%94%A84B%E5%92%8C4H%2C%E6%95%88%E6%9E%9C%E6%9C%89%E4%BD%95%E4%B8%8D%E5%90%8C%E5%91%A2%3F%E4%BB%8E%E5%AF%B9%E6%89%80%E6%9C%89%E9%93%85%E7%AC%94%E7%9A%84%E6%AF%94%E8%BE%83%E4%B8%AD%2C%E8%AF%B7%E8%AF%B4%E6%98%8E%E4%B8%BA%E4%BD%95%E5%A4%9A%E6%95%B0%E4%BA%BA%E5%9C%A8%E4%B8%80%E8%88%AC%E7%9A%84%E7%BA%B8%E4%B8%8A%E5%86%99%E5%AD%97%E8%A6%81%E4%BD%BF%E7%94%A8HB%E9%93%85%E7%AC%94%E8%80%8C%E4%B8%8D)
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