一、試述拆修離心泵葉輪時，應注意檢查那些部分？（20 分）

五、請將下列英文譯成中文：（20 分） At deviations between actual rudder position and the desired rudder position, a port or starboard signal is given to the electrical directional-control valve. The control valve changes its position and hydraulic oil is lead in an out of the respective chambers at the steering gear, shifting the rudder angle towards the desired position as long as the deviation exists.