A.20% B.30% C.40% D.50%
A.轉(zhuǎn)速<2985或轉(zhuǎn)速>3015 B.轉(zhuǎn)速信號測量故障 C.并網(wǎng) D.汽輪機(jī)跳閘
A.P B.PI C.PD D.PID