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将Se(Ⅵ)还原成Se(Ⅳ) 将Se(Ⅳ)氧化成Se(Ⅵ) 消除共存Se(Ⅵ)的干扰 消除共存与元素的干扰
GRE幅值较SE小，图像信噪比高 GRE幅值较SE小，图像信噪比低 GRE幅值较SE大，图像信噪比高 GRE幅值较SE大，图像信噪比低 GRE幅值较SE小，图像信噪比相同
GRE幅值较SE小，图像信噪比高 GRE幅值较SE小，图像信噪比低 GRE幅值较SE大，图像信噪比高 GRE幅值较SE大，图像信噪比低 GRE幅值较SE小，图像信噪比相同
SE.>03Ri SE.=03Ri SE.<03Ri SE.≥03Ri
the cost of advertising a product the effect of advertisement on people' s lives the benefits advertisement brings various media for advertising products
marketing advertising salespeople agents
advertising is no different from person -to- person selling in substance advertising extends sales promotion to a larger area advertising has greatly improved the production of goods it is very expansive to advertise a new product
X-1．96SE≥XT X-1．96SE≌XT≌X+1． 96SE X+1．96SE≤XT X-1．96SE＜XT≤X+1．96SE
Se＜15％ 15％≤Se＜35％ 35％≤Se＜70％ Se≥70％
Se6＋ Se4＋ Se2－ 总硒 Se6＋和Se4＋
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