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

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

出自：海船船员证

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