Western powers are concerned that Iran is seeking to enrich uranium to a purity high enough to make nuclear weapons, which experts say is around 90 percent.
西方大国担心，伊朗在试图将铀浓缩到武器级别纯度。专家说，武器级别的铀纯度大约在90%。
The purity of TMH was confirmed by 13C-Nuclear Magnetic Resonance (NMR) spectroscopy.
用13C-核磁共振谱表征了三羟甲基庚烷的化学结构。
The purity of TMH was confirmed by 13C-Nuclear Magnetic Resonance (NMR) spectroscopy.
用13C-核磁共振谱表征了三羟甲基庚烷的化学结构。
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