单项选择题
（） are used to limit the pressure in any particular portion and mainly control the pressure after the valve.
A.Relief valves
B.Check valves
C.Safety valves
D.Reducing valve
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相关考题
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单项选择题
Among the basic categories of equipment, which of the following is used to convert hydraulic energy into continuous rotary motion?（）
A.Hydraulic pumps
B.Valve
C.Hydraulic cylinders
D.Hydraulic motors -
单项选择题
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 -
单项选择题
The drive motor will have a brake arranged to fail-safe, i√eit will （） the load if power fails or machine is stopped.
A.cast
B.put
C.hold
D.let out
