A.15sB.35sC.25sD.45s
A.0.99B.0.95C.0.9D.0.85
A.频率50Hz,允许偏差-2%~+1%B.频率50Hz,允许偏差-1%~+2%C.频率60Hz,允许偏差-2%~+1%D.频率60Hz,允许偏差-1%~+2%