Which of the electrical properties listed will always be the same for each component in a parallel circuit?（）

A.Frequency meter
B.Ammeter
C.Voltmeter
D.All of the above

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