1. Qhov tob tob yog dab tsi? Lub qhov tob yog txhais tau tias muaj qhov ntev-rau-lub qhov taub qhov sib piv ntau dua 10. Feem ntau qhov sib sib zog nqus muaj qhov tob-rau-inch piv ntawm L / d≥100, xws li lub tog raj kheej qhov, ncej axial roj qhov, hollow spindle qhov. , hydraulic valve qhov, thiab lwm yam. Cov qhov no feem ntau xav tau ib ...
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