Cov phuam da dej yog ib qho tseem ceeb ntawm peb lub neej niaj hnub, txawm tias nws yog rau ziab tawm tom qab da dej, so hauv pas dej, lossis ntaus lub puam.Thaum mus yuav cov phuam da dej, koj tuaj yeem hla lo lus "GSM" thiab xav tsis thoob tias nws txhais li cas.GSM sawv cev rau grams ib square meter, thiab nws yog ...
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