疼痛的神經(jīng)傳導(dǎo)主要通過哪種神經(jīng)纖維進(jìn)行?A. A類神經(jīng)纖維B. B類神經(jīng)纖維C. C類神經(jīng)纖維和無髓鞘神經(jīng)纖維D. D類神經(jīng)纖維