题目:对于内燃叉车而言,货叉的起升速度和门架的前、后倾速度由()控制。 For internal combustion forklifts, the lifting speed of the forks and the forward and backward tilting speed of the gantry are controlled by ().
A. 操作手柄的开度大小The opening size of the joystick
B. 发动机的转速Engine RPM
C. 操作手柄的开度大小和发动机的转速共同The opening size of the joystick and the engine speed are both related
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