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單項選擇題

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

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單項選擇題

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)

單項選擇題

Possible phase relationships between voltage and current in an alternating current circuit include which of the following conditions?（）

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