Among the basic categories of equipment, which of the following are used to convert mechanical into hydraulic energy?（）<br>A:The hydraulic pumps<br>B:Valves<br>C:Hydraulic cylinders<br>D:Hydraulic motors

Among the basic categories of equipment, which of the following are used to convert mechanical into hydraulic energy?（）
A:The hydraulic pumps
B:Valves
C:Hydraulic cylinders
D:Hydraulic motors

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