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Teacher Sherry (小学一年级至六年级和中学中一至中五)
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3.5 Ch em ic al Fo rm ul ae There are two types of chemical formula『Chemical Formula有分为2种』: ● Empirical Formula 「Chemical formula whic...
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Teacher Sherry (小学一年级至六年级和中学中一至中五)
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Teacher Sherry (小学一年级至六年级和中学中一至中五)
蓝色的!!!
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好的^^ 谢谢通知~XD
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