单项选择题
A.the pump going to full stroke
B.closing of the six-way valve
C.driving the rams up against the stops
D.a corresponding slowing or increasing of the pumped flow rate
单项选择题 As the designated rudder angle is being achieved, as a result of the original command input, the steering gear follow-up mechanism is（）
单项选择题 In a fixed displacement axial piston hydraulic motor, the speed is varied by（）
单项选择题 In a shell-and-tube type hydraulic fluid cooler, the amount of heat transferred from the hydraulic fluid to the cooling water depends upon（）