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Intellectual role: Calculator history- [Hui Cong manages network of general articles for use] Speak of a calculator, those who be worth our pride is, the earliest computation tool is born in China. The tool of a kind of computation that Chinese ancient time uses the...
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- The research history of electronic paper
- The research of electronic paper and electronic Chinese ink is developed, already had taken 20 many year up to now. In 20 centuries 70 time, the company below Japanese pine published electrophoresis to demonstrate a skill above all,...
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- The ball-pen that goes up except clothings opportunely is oily
- Warm water of immerge of place of 1. general besmirch (40 ℃ ) use benzene or dip in with cotton group benzene rub is washed, wash with scour next, clear water (Wen Shui) strong clean. 2. soaks besmirch to be in with cold water...
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- 4 great skill teach you how stationery of safety of choose and buy
- Student things installs countrywide mark to will be about to be carried out formally on April 1, as the parent you, how to know to identify, does the choose and buy learn articles for use safely? If your heart is medium,still be in...
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- Intellectual role: New-style function pen introduces
- Environmental protection pen: Raw material comes from natural plant resource, the rice starch that use jade is made, litter does not cause any impact to the environment Mobile pencil: Pushbutton type is more...
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