農資農科模板

Celebrate Qingyuan Weixin Stationery Co., Ltd. Website revision online!After friendly negotiations, Qingyuan Weixin Stationery Co., Ltd. A partnership with @JCSW!New version: www.hg0925.comEnterpri...

The hardness mark of lead pencil is usually "H" for hard pencil, "B" for soft pencil, "HB" for moderate hardness pencil, "F" for hardness between HB and H pencil.

Qingyuan Weixin Stationery Co., Ltd. I wish you all a happy New Year, New Year new atmosphere!

In 1662, the first pencil factory in the world was established in Nuremberg, Germany.

1. Is the pencil lead poisonous?It's not actually toxic, lead is toxic, and graphite and clay are the main materials used to make pencil leads, so they're not toxic.The bases of the pencil lead is ...

Divided into pencil cap and pencil rod two parts: pencil cap appearance decoration material is mainly polyester material, production process can be divided into molding, offset printing, assembly a...