1. Txhua yam kev sib xyaw qhuav mortar, txhua yam pob zeb, hnav-tiv taus cov ntaub ntawv, kev lag luam hauv pem teb, pub kev lag luam, tanning Tus nqi ntawm calcium formate ib tuj qhuav mortar thiab pob zeb yog li ntawm 0.5 ~ 1.0%, thiab qhov siab tshaj plaws ntxiv. yog 2.5%. Tus nqi ntawm calcium formate yog maj mam nce ...
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