单项选择题

Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）

A.Pressure-reducing valve
B.Unloading valve
C.Counterbalance valve
D.Pressure-relief valve

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单项选择题

A.motor overload would open
B.relief valve would open
C.pump would eventually overheat
D.motor would overheat

单项选择题

A.Compound gage
B.Bonrdon tube
C.Manometer
D.Deadweight gage

单项选择题

A.cavitation
B.water hammer
C.fluid friction
D.steam knock