题目内容

档案的作用是指企业事业单位文件材料经过归档,进入“保存阶段”后所发挥的作用。

A. 正确
B. 错误

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Which of the following statements is correct concerning a typical shipboard multi-coil refrigeration system?()

A. The liquid receiver functions to collect and remove non-condensable gases
B. A thermostatic expansion valve is used to control refrigerated space temperature
C. Refrigerant temperature in an evaporator is directly related to refrigerant pressure
Dehydrators must be used continuously in a refrigeration system

某型号离心泵的特性方程为H=f(qV)。若N台这样的泵串联,串联泵的特性方程为()。

A. H=Nf(qV)
B. H=f(qV)/N
C. H=f(qV/N)
D. H=f(NqV)

()是一种借鉴生物界自然选择和自然遗传机制的高度并行、随机、自适应搜索算法。

A. 神经网络
B. 蚁群算法
C. 模拟退火
D. 遗传算法

发电机运行中三相定子电流不平衡之差不许超过多少?如果超出规定值都有哪些原因?

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