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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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Cost, coverage, choice - 2 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

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℃

舒适性空调的换气次数每小时不宜小于（）次？

A. 3
B. 4
C. 5
D. 6

关于空调系统（房间）的新风量应满足的条件中，不符合规范规定的是（）

A. 新风量占送风量的百分数不应低于10%
B. 能补偿排风量
C. 应不小于人员所需新风量
D. 能保持室内正压所需风量