Ý nghĩa các con số ghi trên Bút Chì bạn đã biết chưa?
Bút chì 2B, 3B, 4B là gì? Bạn cũng đã biết chưa? Hãy tham khảo bài viết dưới đây để tìm câu trả lời cho mình nhé.
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