【正文】
trace element。 and the contents of nutrient ponent and trace elememt is highter than other vegetables with the exception of total sugar and copper, respectively. The result contributes to science evidence and reference of vegetable value of stem of sweet potato.Keywords: stem of sweet potato。注:(1)書要正式出版的;(2)作者三人以上用等!以上沒有注明部分均為單倍行距,數(shù)字與英文均為Times New RomanAnalysis on the Nutrients and Trace Element of Stem of Sweet Potato題目小四號加粗J