By means of theory calculating and analyzing,increasing steel ball section and reality filling up rate(from 26% to 46%),raising tube body speed(from 26.1r/min to 37.3r/min),main bearing from sliding bearing changed ball-bearing are used.是什么意思_By means of theory calculating and analyzing,increasing steel ball section and reality filling up rate(from 26% to 46%),raising tube body speed(from 26.1r/min to 37.3r/min),main bearing from sliding bearing changed ball-bearing are used.在线翻译_英语_读音_用法_例句