A、≤5% B、≤10% C、≤15% D、≤20%
A、0.5mill B、0.6mill C、0.7mill D、0.8mill
A、電樞對地絕緣電阻 B、電樞軸承內圈和軸的接觸電阻 C、電樞片間電阻 D、電機主極繞組、附加極與補償繞組阻值