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方法：应用理化方法，对20例胃肠癌和周边组织作微量元素检测。
Methods:Trace elements in stomach and intestine cancers and its peripheral tissue were determined in 20 cases with chemical and physical means.
微量元素检测受到多种因素的影响，其正常参考区间的建立也显得非常复杂。
Trace element test results are affected by various factors and the establishments of reference intervals are also complicated.
检测了240例反复呼吸道感染患儿血微量元素含量。
The trace element content of 240 children with repetitive respiratory infection was detected and studied.
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