Qhia: Gypsum-raws li cov ntaub ntawv yog dav siv nyob rau hauv kev tsim kho tej yaam num rau lawv lub zog, durability thiab hluav taws kub. Cov ntaub ntawv no yog ua los ntawm gypsum, ib qho ntxhia sib xyaw uas feem ntau pom hauv cov pob zeb sedimentary, thiab dej. Gypsum-raws li cov ntaub ntawv feem ntau yog siv rau phab ntsa, qab nthab thiab fl ...
Nyeem ntxiv