Qhov twg yog qhov nyuaj dua, txhaj tshuaj pwm lossis stamping pwm?Txhaj pwm thiab stamping pwm muaj lawv tus kheej cov yam ntxwv thiab cov teeb meem, nws yog qhov nyuaj rau txiav txim ncaj qha uas yog qhov nyuaj dua.Lawv sib txawv hauv kev tsim, tsim khoom, thiab kev siv, yog li lawv qhov nyuaj feem ntau nyob ntawm qhov tshwj xeeb ...
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