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單項(xiàng)選擇題

The sub-multiple prefix “micro” 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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單項(xiàng)選擇題

A signal derived from a controlled function and returned to the initiating point is called a/an （）.

A.monitoring signal
B.inverse signal
C.reverse signal
D.feedback signal

單項(xiàng)選擇題

The purpose of a main switchboard circuit breakers reverse-power trip is to （）.

A.prevent main circuit overload
B.protect the circuit breaker blowout coil
C.prevent alternator motorization
D.prevent low voltage tripout

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