A fuse that blows often should be replaced only with a fuse of ().
A、the recommended current and voltage rating
B、higher current and voltage rating
C、higher current and lower voltage rating
D、lower current and higher voltage rating
A、the recommended current and voltage rating
B、higher current and voltage rating
C、higher current and lower voltage rating
D、lower current and higher voltage rating
A、the recommended current and voltage rating B、higher current and voltage rating C、higher current and lower voltage rating D、lower current and higher voltage rating
A、higher than that of copper B、lower than that of copper C、equal to that of copper D、reached when the conductor it is protecting becomes "white hot"
A、A.that blows towards the sea at night B、B.that blows towards an island during the day C、C.caused by cold air descending a coastal incline D、D.caused by the distant approach of a hurricane
A、A.that blows towards the sea at night B、B.that blows towards an island during the day C、C.caused by cold air descending a coastal incline D、D.caused by the distant approach of a hurricane
A、copper and antimony B、steel and babbitt C、aluminum or beryllium alloy D、zinc or an alloy of tin and lead
A、A.seawater contamination B、B.frequent surface blows C、C.dissolved oxygen deaeration D、D.frequent bottom blows
A、light,variable winds with little or no humidity B、strong,gusty winds that blow from the same general direction all year C、steady winds that reverse direction semiannually D、strong,cyclonic winds that change direction to conform to the passage of an extreme low pressure system
A、light,variable winds with little or no humidity B、strong,gusty winds that blow from the same general direction all year C、steady winds that reverse direction semiannually D、strong,cyclonic winds that change direction to conform to the passage of an extreme low pressure system
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