题目内容

Films are formed by extrusion and ______ or by calendering.

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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 ______ .

Recyclable means that a material, after completing its life cycle in one component, could be ______ , could reenter the materials cycle, and could be reused in another component—a process that could be repeated an indefinite number of times.