单项选择题
A.portable growler B.galvanometer C.visual inspection D.megohmmeter
A generator is prevented from becoming motorized by the...
单项选择题A generator is prevented from becoming motorized by the use of a/an （）.
A.over-speed trip B.reverse power relay C.back pressure trip D.governor controls
Which of the electrical properties listed will always b...
单项选择题Which of the electrical properties listed will always be the same for each component in a parallel circuit?（）
A.Impedance B.Current C.Resistance D.Voltage
A switchboard, for a AC electrical distribution system,...
单项选择题A switchboard, for a AC electrical distribution system, will be provided with which of the following components （）.
A.Frequency meter B.Ammeter C.Voltmeter D.All of the above
