单选题Among the basic categories of equipment, which of the following are used to convert mechanical into hydraulic energy?（）AThe hydraulic pumpsBValvesCHydraulic cylindersDHydraulic motors
单选题
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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