The infrared spec-trum of the grafted down-powder showed that the content of carbonyl and S O bond increase but the content of CH2bond decrease.是什么意思_The infrared spec-trum of the grafted down-powder showed that the content of carbonyl and S O bond increase but the content of CH2bond decrease.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句