A.機(jī)組頻率 B.電網(wǎng)頻率 C.磁極對(duì)數(shù) D.機(jī)組負(fù)荷
A.零 B.小數(shù) C.1 D.分?jǐn)?shù)
A.淬火+低溫回火 B.淬火+中溫回火 C.淬火+高溫回火 D.淬火+正火