一块面料的植绒里面有一种纤维看起来比较光滑，滴硝酸有点膨胀，用盐酸、酸、浓硫酸在常温下都无法溶解掉，可能会是什么纤维？[img=,690,1227]https://ng1.17img.cn/bbsfiles/images/2018/11/201811101014245439_1975_3231577_3.jpg!w690x1227.jpg[/img][img=,690,1227]https://ng1.17img.cn/bbsfiles/images/2018/11/201811101014258060_4742_3231577_3.jpg!w690x1227.jpg[/img][img=,690,1227]https://ng1.17img.cn/bbsfiles/images/2018/11/201811101014250699_9014_3231577_3.jpg!w690x1227.jpg[/img]