类别 全部 - rubber - industries - wood - factories

作者:shannon m 5 年以前

223

paper

The production process of pencils involves multiple stages and industries, each playing a critical role in transforming raw materials into the final product. It starts with primary industries where essential raw materials like graphite, wood, aluminum, and rubber are sourced.

paper

secondary industries

primary industries

tertiary industries

pencil

supply store

pencil factory
aluminum

mined from ore bauxite

graphite

mined from rock

wood

factory

trees

rubber

Hevea brasiliensis tree

pumice

factories

magma rock