Lub ntsiab ntau yam ntawm cov khoom siv fiber ntau ceramic

Cov paj rwb xoob 15 feem pua, fiber ntau hlua, ntaub thiab lwm yam textiles 6 feem pua
Daim pam thiab fiber ntau 45 feem pua ​​​​Fiber paper 3 feem pua
Lub tshuab nqus tsev tsim lub rooj tsavxwm, muaj kev xav thiab 25 feem pua ​​​​ntawm cov khoom siv fiber ntau amorphous 6 feem pua
Cov khoom zoo li