单项选择题
A.brushes on a commutator B.brushes on slip rings C.slip rings on a commutator D.direct connections from the stator
Electrical leads and insulation on a motor should be pa...
单项选择题Electrical leads and insulation on a motor should be painted with（）.
A.heat-resisting acrylic B.heat-resisting aluminum C.insulating varnish D.insulating white lead
The electrolyte in a lead-acid storage battery consists...
单项选择题The electrolyte in a lead-acid storage battery consists of distilled water and （）.
A.hydrogen chloride B.calcium chloride C.sulfuric acid D.muriatic acid
A circuit breaker and a fuse have a basic similarity in...
单项选择题A circuit breaker and a fuse have a basic similarity in that they both （）.
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
