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
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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?
局部放电试验时,按干扰信号的波形来区分,下面选项中属于周期性干扰信号的是()
A. 引线的电晕放电
B. 附近的高压试验
C. 载波通信