单选题Under normal operating conditions, the rudder is hydraulically locked unless （）.Athe manual trick wheel is engaged for steeringBthe variable stroke pump is off strokeCa rudder order is given by the control systemDan electric power system failure occurs at the steering gear
单选题
Under normal operating conditions, the rudder is hydraulically locked unless （）.
A
the manual trick wheel is engaged for steering
B
the variable stroke pump is off stroke
C
a rudder order is given by the control system
D
an electric power system failure occurs at the steering gear
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