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單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

The sub-multiple prefix “nano” (n) means （）.

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)

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