The difference between "writer" and "reporter" or "journalist" isnt that the journalist re
【C1】
A.designs
B.fosters
C.develops
D.cultivates
【C1】
A.designs
B.fosters
C.develops
D.cultivates
A、unstable
B、Inaccurate
C、Indistinct
D、ineffective
For a linear continuous-time system, when the initial state isand the input signal is, the output is,; when the initial state isand the input signal is, the output is,. Then, what is the output when the initial state isand the input signal is? ( )
A、
B、,
C、,
D、,
A sinusoidal signalcan be represented by using imaginary exponential signalas ( )
A、
B、
C、
D、
A、Both the imaginary exponential siganland sine signalare periodic signals with the fundamental peroid of.
B、The imaginary exponential signalcan be represented as
C、Both the imaginary exponential siganland sine signalcan be linearly represented by the other signal, and thus, they have the same properties.
D、The greater the, the higher the oscillation frequency of the real and imaginary parts of the imaginary exponential signal.
Given the waveform of a signal, as shown below, it can be represented as ( )
A、
B、
C、
D、
The value of the integralis ( )
A、0
B、4
C、-4
D、2
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