Dual electro-hydraulic steering units usually operate （）.
- Awith both pumps on line at the same time
- Bwith one pump on standby
- Cwith the follow-up gear disconnected
- Donly when the rudder is moved amidshi
问题
Dual electro-hydraulic steering units
参考解析：
分类：船舶辅助机械题库
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