单项选择题
A.monitoring signal B.inverse signal C.reverse signal D.feedback signal
The purpose of a main switchboard circuit breakers reve...
单项选择题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
When you are making a high potential test on a piece of...
单项选择题When you are making a high potential test on a piece of repaired electrical machinery, a rise in leakage current indicates （）.
A.good insulation B.bad insulation C.high insulation power factor D.a high slot discharge factor
The sub-multiple prefix "milli" (m) means （）.A.one thou...
单项选择题The sub-multiple prefix "milli" (m) means （）.
A.one thousandth (10 to the -3rd power) B.one millionth ( 10 to the -6th power) C.one billionth ( 10 to the -9th power) D.one trillionth (10 to the -12th power)
