单项选择题
（）is not installed on the emergency switchboard.
A.Ammeter and changeover switch
B.Speed governor device
C.Synchroscope
D.Wattmeter
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相关考题
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单项选择题
（）is not installed on the emergency switchboard.
A.Control panel
B.Paralleling panel
C.Load panel
D.Busbar -
单项选择题
（）can be used to prevent hydraulic system overloaded or keep the pressure of oil outlet from pump constant.
A.Overflow valve
B.Reducing valve
C.Balancing valve
D.Reducing valve or balancing valve -
单项选择题
The symbol (GB786√1-93) at right side represents （）
A.overflow valve
B.reducing valve
C.relief valve
D.sequence valve
