题目内容
Some fibers are ______ from a viscous melt or solution, after which they are plastically elongated during a drawing operation, which improves the mechanical strength.
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Films are formed by extrusion and ______ or by calendering.
The properties of many polymers make them especially amenable to fabrication by 3D printing—e.g., photosensitivity, flexibility, and ______ melting/softening temperatures.
A material that is used in some end product and then discarded passes through several stages or phases, which is sometimes termed the total materials cycle or just materials ______ and represents the “cradle-to-grave” life circuit of a material.
Sustainability represents the ability to maintain an acceptable lifestyle at the present level and into the indefinite future while preserving the ______ .
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