The purging of air from an elector-hydraulic steering gear unit is necessary when（）
- Achanging over to hand pump operation
- Bengaging the trick wheel
- Cthe system has been filled with new oil
- Dthe rudder angle indicator does not match the helm positio
问题
The purging of air from an elector-hyd
参考解析：
分类：船舶电气与船舶安全题库
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