Copper capillary 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。
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.
对两组贫血患儿用XRF法测定头发及末稍血微量元素铁、铜含量，并与正常值做对比研究。
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