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Polyurethanes:A. Have structure features of both an ester and an amide.B. Have a formula`H_(2)N-underset(O)underset(||)(C )-O-CH_(2)-CH_(3)`.C. Are obtianed from`p`-phenylene disocyanate and ethylene glycol.D. Are used as foam rubber in upholstery.

Answer» Correct Answer - C


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