The rational development and safety of children's food are pointed out.
探讨了儿童食品的合理开发及其安全性。
The decision model has practical value to the rational development of flat seams in China.
本文的决策模型对我国近水平煤层的合理开发有实用价值。
The decision model has practical value to the rational development of flat seams in China.
本文的决策模型对我国近水平煤层的合理开发有实用价值。
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