Kev ua haujlwm ntawm daim phiaj qhia sab nrauv yog mas siv los coj cov pwm sab saud thiab qis kom ntseeg tau qhov sib txheeb ntawm cov pwm sab sauv thiab qis. Cov ntsiab lus xaiv: 1. Cov lus qhia Beaded yog cov nyiam; 2. Tus naj npawb thiab qhov loj ntawm cov ncej taw qhia sab nraud yog tsim nyog xaiv tau raws li qhov loj me ntawm cov pwm; 3. Thaum xaiv qhov ntev ntawm cov ncej txheej txheej sab nraud, xyuam xim rau qhov kev txiav txim siab ntawm txhua ntu ntawm cov pwm thaum kaw cov pwm. Cov lus qhia txheej txheem tom qab kev taw qhia sab hauv phau ntawv qhia Cov txheej txheem punching (hauv) ib feem ntawm cov pwm nkag mus rau txheej pwm sab saud (lossis qis dua).
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