密度选择 meaning in Chinese

density selection

So , the current density should be smaller , in view of the speed of electrochemical reaction , the optimum current density is about 1 ma / cm2
因此，电流密度应适当低一些。综合考虑反应速度，电流密度选择11lla / cmz左右为宜。
Stitch length controlled by marching motor , 24 lenth selectable , adjustable scope supported by subdebision techinilogy : 0 - 650 . the lenth of the knitware can be accuratedly conrolle
线圈密度步进马达控制， 24段密度选择，采用细分技术可调范围； 0 - 650度，更能准确地控制衣片长短。