Coppercapillary tube length is not greater than 20 meters, stainless steel capillary tube length is not greater than 10 meters.
铜毛细管长度不大于20米，不锈钢毛细管长度不大于10米。
2
The ferrum and copper level of hair and ending capillary were determined by XRF on the two groups of children with anemia and compared with normal level.