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The results show that in the presence of small amount of sulphite, the structure of developed grain changes from compact to filamentary and etch pit can be found.
结果表明，少量亚硫酸盐的加入使显影后的银颗粒从紧密结构变成粗银丝结构，并且发现有生成侵蚀坑的现象。
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