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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2.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

3.單項選擇題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

4.單項選擇題Which system(s) in the hydraulic systems of crane always hold(s) single side of load?（）

A.hoisting system only
B.hoisting system and luffing system
C.hoisting system and slew and slewing system
D.slewing system only

5.單項選擇題Crude oil washing of cargo tanks has the following advantages except for （）

A.reducing the erosion of the cargo tanks
B.increasing the total quantity of oil to carry
C.reducing the quantity of water contained in oil
D.reducing cargo discharged time