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春季瑜伽联系特征

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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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有一冷水管道（未保温）穿过空气温度t=30℃，相对湿度为70%的房间，如果要防止管壁产生凝结水，则管道表面温度应为多少？当地大气压力B=101325Pa。

A. 20℃
B. 10℃
C. 15℃
D. 25℃