【简答题】The new system will mostly benefit those who _________ [ A] move into management [ B] work on a part time basis [ C] have retired from the nursing job [ D] have reached the top of the system
【简答题】某列管式换热器的管束由 f 25 ́ 2.5mm 的钢管组成。已知热空气流经管程,冷却水在管外流动;管内空气侧的对流传热系数 , a i =40W/(m 2 × °C ) ,管外水侧的对流传热系数 a o =1500W/(m 2 × °C ) ,钢的导热系数 l =45W/(m 2 × °C ), 空气侧的污垢热阻 R si=5×10 -4 m 2 × °C /W ,水侧的污垢热阻 R so=2...