A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.<br>A:the four-way control valve failing to shift<br>B:the bleeder valve sticking in the open position<br>C:cold hydraulic fluid<br>D:a clogged air vent falter on the oil reservoir

A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
A:the four-way control valve failing to shift
B:the bleeder valve sticking in the open position
C:cold hydraulic fluid
D:a clogged air vent falter on the oil reservoir

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