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The United States has a national system of education.

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Three major products of radioactivity are (Alpha/First), Beta, and Gamma rays.

受拉钢筋在其理论截断点处的应力为零,因此,可在此处将其切断。

The Magna Carta was signed in 1066.

新闻舆论监督的主要对象是公共权力、公共事务和公众人物。()

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