单项选择题
A process of comparing the actual performance of a machine with the intended performance, and the adjusting the machine to reduce and eventually eliminate the difference between the actual and intended performance is called（）
A.open loop control
B.feedback
C.combining control
D.integral process
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相关考题
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单项选择题
The gauge pressure inside a container is -0~5kg/cm2, then what is the absolute pressure exerted to the inside surface of thin container?（）
A.0~05Mpa
B.0~95Mpa
C.1~05Mpa
D.0~5Mpa -
单项选择题
The crane jib is raised and lowered by means of （）
A.a mooring winch
B.a hoisting winch
C.a slewing winch
D.a luffing winch -
单项选择题
Which one of three elements for a fire on a tanker vessel is most difficult to eliminate (isolate)?（）
A.a combustible element, fuel
B.energy (resources for ignition) to start the combustion
C.oxygen to support the combustion
D.both A and C are correct
