If a hydraulic pump is overheating, the cause may be （）.<br>A:excessive internal leakage in the pump<br>B:low discharge pressure and fluid flow<br>C:excessive fluid level in the hydraulic reservoir<br>D:operation of the pump at 100% efficiency

If a hydraulic pump is overheating, the cause may be （）.
A:excessive internal leakage in the pump
B:low discharge pressure and fluid flow
C:excessive fluid level in the hydraulic reservoir
D:operation of the pump at 100% efficiency

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