Increased internal leakage, in addition to poor hydraulic system response,and inadequate lubrication, is the result of （）.<br>A:pump bearings in poor condition<br>B:excessively worn actuator-piston packing<br>C:broken directional control valve centering springs<br>D:low hydraulic oil viscosity

Increased internal leakage, in addition to poor hydraulic system response,and inadequate lubrication, is the result of （）.
A:pump bearings in poor condition
B:excessively worn actuator-piston packing
C:broken directional control valve centering springs
D:low hydraulic oil viscosity

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