[单选] 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 positio
配电网低电压对电动机有何影响？应如何处置？
总线系统信号电压是系统电压的有（） K-CAN。 Lin-BUS。 BSD。 K-BUS。
总分行客户信息主管没有单客户信息缺失提示权限，支行主管、客户经理有查看权限。
The type of carrier required to file a copy of freight tariffs would be the（）. common carrier。 tramp。 public vessel。 bulk carrier。
监管油品时需要注意的问题有哪些？
The purging of air from an elector-hydraulic steering gear unit is necessary when（）
