单项选择题

In the form. of ( ) the output is continuously fed back and compared with the reference input.

A.continuous
B.discontinuous
C.discrete-data
D.sampled-data
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单项选择题
The overall transfer function is the ratio of the transform. of the controlled variable to the transform. of ( ).
A.the
B.the
C.the
D.the
单项选择题
Data stored in RAM ( ) when the power of the computer is turned off.
A.is
B.permanently
C.is
D.temporarily
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