Kev sib tsoo log feem ntau muab faib ua peb pawg, chav kawm A, B chav kawm thiab W chav kawm.
A: feem ntau yog siv rau hauv cov hnub ntawm casting, steel, hlau ua thiab pob zeb thiab lwm yam lag luam.
B: chav kawm ntawm kev ua haujlwm loj, kev lag luam pwm.
W: Cov chav kawm yog siv rau kev sib tsoo precision.
Lub log sib tsoo sab hauv feem ntau yog siv rau kev sib tsoo qhov, uas yog ib qho nyuaj tshaj plaws sib tsoo. Sab nraud txoj kab uas hla ntawm kev sib tsoo log yog nyiam dua 60-80%.