久久ク成人精品中文字幕_中文字幕.av.在线_一级做a爰片性色毛片是免费_国产一区一区_yy6080午夜国产免费福利_国产91香蕉

        Production guarantee:
        Design and manufacture in accordance with German Rexroth hydraulic cylinder technology and standards;
        Process cylinder bore using German deep hole boring machine;
        Grind the piston rod using German abrasive belt grinding center;
        Process cylinder parts such as cylinder head, bottom, etc. using German drilling, milling and boring center;
        Process the piston, guide buffer ring, etc. using Japanese turning center.
 
       Manufacturing standards:
       referenced German DIN24 346 and SMS standards;
       ISO4413;
       GB3766-83: General technical requirements for hydraulic cylinder system;
       GB7935-87: General technical requirements for hydraulic components.