题目内容（请给出正确答案）

[主观题]

Which stage of the materials cycle is the most difficult for manufacturers to develop a full materia

ls cycle？

A) Extracting raw materials

B) Manufacturing engineered materials

C) Service ofproducts and systems

D) Recycling/disposalmaterials

提问人：网友anonymity 发布时间：2022-01-06

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