题目内容
Which of the following polymers belong to thermoplastic polymers? ( )
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On the basis of stress–strain behavior, polymers fall within three general classifications: ( )
The properties of polymers may be further modified by using additives; these include ( ).
The ( ) can be used in 3D printing techniques for polymeric materials.
In engineering practice, other important criteria must be considered in the development of a marketable product. Some of these involve environmental and societal issues such as ( ).
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