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春天的三个月,称为发陈。

A. 对
B. 错

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春天是土型季节。

A. 对
B. 错

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线性电路中的电压、电流和功率都可以通过叠加原理进行分析计算。

A. 对
B. 错

Cost, coverage, choice - 1 of the trade-offs needed to make a healthy nation. As the US Congress struggles to repeal and replace the Affordable Care Act - widely known as Obamacare - we ask what makes

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