1、[物]频率过低
... underframe底架 underfrequency频率过低；低于额定频率 undergage尺寸不足 ...
2、低于额定频率
... underframe底架 underfrequency频率过低；低于额定频率 undergage尺寸不足 ...
3、[物]降低的频率
... underexpansion 不完全膨胀 underfrequency 降低的频率 underspin 自旋不足 ...
underfrequency protection欠频保
underfrequency relay低频继电器
Underfrequency setting低
UF Underfrequency欠频
underfrequency card频率过低卡
underfrequency rela欠频继电器
underfrequency pc card低于额定频率百分数卡