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Mechanical pencil - Wikipedia, the free encyclopedia
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日期：2026-04-25
A mechanical pencil (US English) or a propelling pencil (UK English) or a pen pencil (Indian English)[1][2][3] is a pencil with a replaceable and mechanically extendable solid pigment core called a lead /ˈlɛd/. The lead is not bonded to the outer casing a...看更多
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