Qhov sib txawv ntawm tooj dag thiab tooj liab yog cov khoom siv tseem ceeb

1. Tus nqi sib txawv ntawm tooj dag thiab tooj liab yog tus nqi uas hloov txhua hnub. Nws yog ib qho nyuaj hais. Qhov tseeb yog tias tus nqi tooj liab yog siab. Brass yog pheej yig. 2. Liab tooj liab muaj ob peb impurities. Koj tuaj yeem xav tias nws yog tooj liab ntshiab. Brass yog ib qho alloy ntawm tooj liab thiab lwm yam hlau.

Yog tias koj muaj lus nug, thov hu rau peb. Peb lub tuam txhab tuaj yeem tsim ntau yam koob txhaj tshuaj, koob tshuaj kho mob, koob txhaj tshuaj, koob tshuaj hypodermic, koob txhaj tshuaj, koob tshuaj tiv thaiv kab mob, koob txhaj tshuaj, koob txhaj tshuaj, koob tshuaj tua tsiaj, koob xaum koob, koob ovum khaws koob, koob txhaj tshuaj, thiab lwm yam Yog tias koj xav tau kev kho. koob cov khoom, thov hu rau peb. Peb tos ntsoov rau koj qhov kev nug! Qhov zoo ntawm cov khoom tsim nyob rau hauv peb lub Hoobkas yuav txaus siab rau koj!

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