Cov qib kev ua tau zoo ntawm bolts rau steel qauv kev sib txuas tau muab faib ua ntau tshaj 10 qib xws li 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, thiab lwm yam. Ntawm lawv, bolts ntawm qib 8.8 thiab siab dua yog ua. ntawm cov hlau tsis tshua muaj carbon hlau los yog cov hlau nruab nrab carbon thiab yog cov cua sov kho (quenching, t ...
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