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Ningbo Qinghua Science & Education Equipment Co.,Ltd. is the member of the teaching apparatus line association , being subordinate to the National Education Ministry , and the leading enterprise in ZheJiang teaching apparatus . 

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physics demonstrated by newtons cradle balance balls china
Newtons cradle balance balls china demonstrates the law of conservation of energy and the law of momentum.
Some understanding of ph meter digital
For many people, they are not unfamiliar with ph meter digital and know how to use it, but they still often ignore many problems that need attention. Then, let’s introduce the related precautions of ph meter digital in detail:

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