题目:操纵多路阀时叉车油泵电机不工作的原因是 The reason why the forklift oil pump motor does not work when manipulating the multi way valve is
A. 油泵电机开关失灵 Oil pump motor switch malfunction
B. 电压过低 Voltage too low
C. 电机故障 Motor malfunction
D. 门架润滑不良 Poor lubrication of the door frame
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