Ebumnobi ọla na-ezo aka n'ihe ezubere iche nke ihe na-ebu ike dị elu nke na-emetụta. Na mgbakwunye, site na iji dochie ihe dị iche iche iche (dịka, aluminum, ọla kọpa, igwe anaghị agba nchara, titanium, nickel targets, wdg), usoro ihe nkiri dị iche iche (dịka, superhard, wear-resistant, anti-corrosi ...
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