G 峰是碳环和碳链中的sp2键的伸缩模式（stretching mode）导致的，它在2700cm。附近。
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bond-stretching mode 键伸模
symmetric stretching mode 对称伸缩模
unsymmetric stretching mode 非对称伸缩振动
stretching vibration mode 伸缩振动模
The Raman peaks for oxygen vacancy and OH stretching mode were observed.
实验中观察到氧空位和OH基团的喇曼峰。
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In iOS 6, the resizableImageWithCapInsets:resizingMode: method allows the caller to specify a tiling or stretching resizing mode.
ENGADGET: Apple seeds iOS 6 beta 4 to developers: here's the changelog
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