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You are the only one who can reveal the secret.
VOA: special.2009.01.31
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You are required only to put the one or two-letter chemical abbreviation, the symbol.
你们只需要,用一两个字母来代表一个化学元素。
麻省理工公开课 - 固态化学导论课程节选
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You are required only to put the one or two-letter chemical abbreviation, the symbol.
你们只需要,用一两个字母来代表一个化学元素。
麻省理工公开课 - 固态化学导论课程节选
