Cov lus taw qhia, tseem hu ua phau ntawv qhia pins, feem ntau yog ua los ntawm cov kabmob hlau thiab kub tuag hlau. Vim tias kev siv ntau ntawm SUJ2 cov kabmob hlau, cov lus qhia tom qab muaj cov kav ntev thiab kev sib hloov ua ke ntawm kev coj ua. Tom ntej no, cov pwm tsim kev lag luam tsuas yog coj koj tus yam ntxwv thiab kev faib tawm ntawm cov lus qhia hauv.
Cov yas pwm ntu muaj cov yam ntxwv ntawm kev ua haujlwm siab, siab precision, ci xim ci ci, thiab lwm yam. Cov ntawv qhia ncej feem ntau yog cylindrical thiab feem ntau muaj roj av. Tus naj npawb ntawm cov roj roj nce ntxiv raws li qhov muab ncua ntev ntawm phau ntawv qhia kev tshaj tawm, thiab tus naj npawb ntawm cov roj grooves feem ntau yog 8.
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