Cov khoom siv uas hnav yog qhov tseem ceeb rau kev ua haujlwm zoo ntawm lub tshuab txiav. Peb lub chaw tsim khoom tuaj yeem ua tiav cov kab tiav ntawm cov khoom siv uas tiv taus kev hnav rau cov tshuab txiav raws li cov neeg siv khoom kos duab. Nyob ntawm cov xwm txheej kev pabcuam thiab lwm yam tseem ceeb, cov khoom siv no tau muab los ntawm ib qho ntawm ntau qib tshwj xeeb ntawm cov hlau manganese. Peb lub tshuab txiav hlau manganese "tus kheej-txhuam" hauv cov qhov pin, uas txo qis kev hnav ntawm cov pin shafts.
Peb tuaj yeem pov rau hauv qab cov khoom hnav ntawm lub shredder:
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Lub sijhawm tshaj tawm: Kaum Ib Hlis-04-2025