Phát biểu nào sau đây đúng?A. Tơ nilon-6,6 được điều chế từ phản ứng trùng hợp bởi hexametylenđiamin và axit ađipic.B. Tơ nilon-6, tơ nilon-6,6 đều là các tơ nhân tạo.C. Trùng ngưng axit ε-aminocaproic, thu được policaproamit.D. Tơ nilon-7 thuộc loại tơ polipeptit

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