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单项选择题

Which of the following does a mother tree NOT do to the younger trees?

A.
B.
C.
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单项选择题
The following statements refer to situations occurring in Process Q of an organisation which operates a series of consecutive processes: (i) Direct labour is working at below the agreed productivity level. (ii) A machine breakdown has occurred. (iii) Direct labour is waiting for work to be completed in a previous process. Which of these situations could give rise to idle time?
A、(i) and (ii) only
B、(i) and (iii) only
C、(ii) and (iii) only
D、(i), (ii) and (iii)
单项选择题
学习支架可以包括如下的哪些类型？
A、问题
B、提示
C、对话
D、图表
未知题型
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。
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