非稳态计算题3。 某容器中装有100℃的食品料液3000kg，比热为2.5 kJ/(kg·K)，需要通过换热蛇管用冷水使其冷却到70℃。已知冷却水的初温为25℃，流量为1000kg/h，比热为4.187 kJ/(kg·K)，换热面积为5 m2，传热系数为200W/(m2·K)。求将料液冷却到规定温度所需的时间。

在RC微分电路中，已知R=100欧，C=0.5uF，电路的时间常数为（ ）。A.2ms

未知题型在RC微分电路中，已知R=100欧，C=0.5uF，电路的时间常数为（ ）。

You make the statistics meaningful to the audience by t...

单项选择题You make the statistics meaningful to the audience by the following ways except ______.

Moura uses the economic order quantity formula (EOQ) to...

单项选择题Moura uses the economic order quantity formula (EOQ) to establish its optimal reorder quantity for its single raw material. The following data relates to the stock costs: Purchase price: $15 per item