When steering on autopilot which of the following input conditions may NOT have an effect on the control of the steering gear（）.

A.Non-follow-up

B.Rudder adjustment

C.Weather adjustment

D.All the above may be activated

边际成本曲线与平均成本曲线的关系是（）。

A.平均成本曲线在边际成本曲线的极值点相交

B.边际成本曲线在平均成本曲线的极值点相交

C.边际成本曲线在平均成本曲线的极值点相切

D.平均成本曲线在边际成本曲线的极值点相切