Tom qab lub khob iav tau tsim thiab tsim, qee zaum lub raj mis yuav muaj ntau qhov chaw ntawm daim tawv nqaij wrinkled, npuas khawb, thiab lwm yam, feem ntau tshwm sim los ntawm cov laj thawj hauv qab no:
1. Thaum lub khob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob.
2. Lub sab sauv ntawm lub tshuab pub mis tau raug txiav, thiab qhov caws pliav tshwm nyob rau hauv lub raj mis tom qab tus neeg lub raj mis tau tsim.
3. Cov khoom ntawm cov pwm pwm thiab molding ntawm lub khob iav tsis zoo, qhov ntom ntom tsis txaus, thiab oxidation ceev heev tom qab qhov kub thiab txias, tsim cov ntsiab lus me me rau ntawm cov pwm, uas ua rau saum npoo ntawm cov pwm. iav lub raj mis tom qab tsim.
