单项选择题
A.small wire brush B.compressed air jet C.clean dry cloth D.10% solution carbon solvent and water
Aboard ship, a grounded field coil in an AC motor can b...
单项选择题Aboard ship, a grounded field coil in an AC motor can be determined by using a （）.
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
