1. Kev siv cov kis kab mob, kev lag luam, kev nyab xeeb thiab txhim khu kev qha.
2. Reducer, txawb hlua tsav, suab nrov qis, kev pab lub neej ntev.
3. Ua haujlwm zoo, ntxuav thiab tu cev.
4. Siv cov khoom ntim tsis siv khoom, kev ua haujlwm siab, zoo tshaj.
5. Tsis siv neeg kis tau tus mob, tsis siv neeg seem, automatic ncej, molding, txuag zog.
6. Ntau pab pawg dov, yob daim duab, pub npau suav, lub vaj huam sib luag zoo.