单项选择题

A.the lack of a feedbackB.the presence of a feed backC.……

The closed-loop system differs from the open-loop system by（）

A.the lack of a feedback
B.the presence of a feed back
C.the lack of a computer
D.the presence of a computer

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热门试题

单项选择题From the passage, we can learn that the simplest controller action is（）

A.two-step controller action
B.proportional, controller action
C.integral controller action
D.derivative controller action

单项选择题Which kind of the following controllers is the most sophisticated controller?（）

A.Proportional controller
B.Integral controller
C.Derivative controller
D.PID controller

单项选择题The word “offset” most probably means（）

A.predetermined value
B.measured value
C.off-limit
D.sustained deviation

单项选择题TWO STEP CONTROLER ACTION is mainly（）

A.proportional control
B.integral control
C.derivative control
D.on-off control

单项选择题In the event of failure of an auxiliary such as a lubricating pump, the standby pump is started and put on the line automatically“the line” in this sentence refers to（）

A.fuel manifold
B.lubricating pipe line
C.auxiliary engine pipe line
D.generator output line