单项选择题
A.7 knots
B.10 knots
C.15 knots
D.20 knots
单项选择题 The follow-up gear on an electro-hydraulic steering gear（）
单项选择题 When the helm demands a 20°right rudder movement from an electro-hydraulic steering gear, which of the listed actions will be the FIRST action to happen when this rudder position is attained?（）
单项选择题 In an electro-hydraulic steering gear, any change in relative position between the synchronous receiver and the follow-up gear will result in（）