Bolts yog ib feem tseem ceeb ntawm txhua qhov kev lag luam, los ntawm kev tsim kho mus rau kev tsim khoom.Ntawm ntau txoj kev xaiv ntsia liaj qhov rooj, DIN933 thiab DIN931 yog ob hom kev siv ntau.Hauv blog no, peb yuav tshawb nrhiav qhov sib txawv ntawm cov bolts, lawv cov ntawv thov, thiab qhov twg yog qhov zoo tshaj plaws rau ib qhov project tshwj xeeb.DIN 933...
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