单选题The purging of air from an elector-hydraulic steering gear unit is necessary when（）Achanging over to hand pump operationBengaging the trick wheelCthe system has been filled with new oilDthe rudder angle indicator does not match the helm position
单选题
The purging of air from an elector-hydraulic steering gear unit is necessary when（）
A
changing over to hand pump operation
B
engaging the trick wheel
C
the system has been filled with new oil
D
the rudder angle indicator does not match the helm position
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