单选题Dual electro-hydraulic steering units usually operate （）.Awith both pumps on line at the same timeBwith one pump on standbyCwith the follow-up gear disconnectedDonly when the rudder is moved amidships
单选题
Dual electro-hydraulic steering units usually operate （）.
A
with both pumps on line at the same time
B
with one pump on standby
C
with the follow-up gear disconnected
D
only when the rudder is moved amidships
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