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【单项选择题】

A circuit breaker and a fuse have a basic similarity in that they both ().

A、A.can be reset to energize the circuit

B、B.should open the circuit when overloaded

C、C.will burn out when an over current flow develops

D、D.All of the above

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第1题

Acircuit breaker  B、amplifier  C、diode  D、capacitor  

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第2题

Acircuit breaker  B、amplifier  C、diode  D、capacitor  

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第3题

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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第4题

A、can be reset to energize the circuit  B、should open the circuit when overloaded  C、will burn out when an over current flow develops  D、All of the above  

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第5题

A、melts and must be replaced  B、is enclosed in a tube of insulating material with metal ferrules at each end  C、gives no visual indication of having opened the circuit  D、trips to break the circuit and may be reset  

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第6题

A、melts and must be replaced  B、is enclosed in a tube of insulating material with metal ferrules at each end  C、gives no visual indication of having opened the circuit  D、trips to break the circuit and may be reset  

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第7题

A、cannot be detected tinder normal conditions  B、is of no consequence to engineering personnel  C、is indicated at the branch circuit breaker panel  D、is indicated by the ground detecting lamps on the main switchboard  

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第8题

A、shunt field  B、circuit breaker  C、metal framework  D、inter-pole  

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第9题

A、leaking unloader  B、tripped circuit breaker  C、control line leak  D、defective pop valve  

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