单选题Among the basic categories of equipment, which of the following are used to allow the hydraulic energy to be controlled?（）Ahydraulic pumpsBvalvesChydraulic cylindersDhydraulic motors
单选题
Among the basic categories of equipment, which of the following are used to allow the hydraulic energy to be controlled?（）
A
hydraulic pumps
B
valves
C
hydraulic cylinders
D
hydraulic motors
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