A.Frequency meter
B.Ammeter
C.Voltmeter
D.All of the above
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A.thousandth (10 to the-3rd power)
B.millionth (10 to the-6th power)
C.billionth (10 to the-9th power)
D.trillionth (10 to the-12th power)
A.Current and voltage may be in phase
B.Current may lead the voltage
C.Current may lag the voltage
D.All of the above
A.directly as its length and inversely as its cross-sectional area
B.inversely as its length and directly as its cross-sectional area
C.directly as its length and directly as its cross-sectional area
D.inversely as its length and inversely as its cross-sectional area
A.Frequency meter
B.Ohmmeter
C.Induction voltage regulator
D.Current transformer governor
A.bridge control panel
B.disconnect links
C.governor relay box
D.main switchboard
最新試題
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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