[单项选择]One of Nathaniel Hawthorne's masterpieces is ______. A. The Scarlet Letter. B. The Fall of the House of Usher. C. Note of a Native Son. D. The Streetcar Named Desire.
第14题: [单项选择]在一间壁换热器中,两流体均在湍流下进行换热。冷热流体的对流传热系数分别为150kW/(m2·℃)和300kW/(m2·℃)。若仅使某一侧流体的流速加倍以强化传热,则总传热系数增加的最大百分数大约为(
)。(可按平壁处理,忽略管壁热阻、污垢热阻和热损失) A. (16% B. (20% C. (40% D. (50% 参考答案:C