單項(xiàng)選擇題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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2.單項(xiàng)選擇題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