单项选择题
In a hydraulic system, （） are used to protect the system from over pressure.
A.stop valves
B.check valves
C.safety valves
D.reducing valves
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相关考题
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单项选择题
A hydraulic motor may be driven by （）.
A.an electric motor
B.a diesel engine
C.a compressor
D.oil -
单项选择题
A high rate of separation between oil and water is favored by （）.
A.large size of oil globule
B.low temperature
C.high viscosity
D.high flow rate -
单项选择题
When started, a complete oily water separating unit is first filled （）The oily water mixture is then pumped through the inlet pipe into the coarse separating compartment.
A.with dirty water
B.with clean water
C.by oily water
D.by mixed water
