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¿Cómo sé si un lápiz es duro o blando? | Yahoo Respuestas
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¿Cómo sé si un lápiz es duro o blando? | Yahoo Respuestas
Website URL:
https://mx.answers.yahoo.com/question/index?qid=20101024031236AAQYWse
Category:
Health Medical
Oct 24, 2010 · Es algo de H y B, el HB es blando o duro? Y el 2HB? ... Un lápiz muy duro, como un 9H, tiene sólo un 41% de grafito, ... 1=B, 2=HB, 2 1/2=F, 3=H, 4=2H.
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