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操作太慢的話晶體會濺出來……
前一種物質是含有結晶水的化合物比較穩定,如果只有少量水存在時,則有不含結晶水的物質生成,而不含結晶水的化合物會發生分解;後一種物質是不含有結晶水時就可以穩定存在的化合物.
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