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單項選擇題

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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單項選擇題

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

單項選擇題

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