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提问人：网友wl36978 发布时间：2022-01-07

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Which of the following statements best explains "wireless holds the key"？A．Wireless Intern

Which of the following statements best explains "wireless holds the key"？

A．Wireless Internet access is crucial to the development of music industry.

B．Wireless telephone should be used universally.

C．Wireless Internet connection is applicable without question.

D．Wireless Internet connection will be the most profitable means of connection.

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更多“Which of the following statements best explains "wireless holds the key"？A．Wireless Intern”相关的问题

第1题

Ice hockey is most physical of all in Winter Olympics because it permits body contacts, and sticks and puck are destructive in despite of protective covers. Moreover, the fighting is common in ice hockey and it is admitted to be part of key culture of the sport.

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第2题

石灰石的主要化学成分是（）

A. CaCO3

B. SiO2

C. Al2O3

D. Fe2O3

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第3题

This random process X (t) =cos(2πfct). the frequencies can be 100, 200, . . . , 600 Hz，then:

A、The possible values of X (0.001) could be cos(0.2π), cos(0.4π), . . . , cos(l .2π)，and each has a probability 1/6.

B、The possible values of X (0.001) could be cos(0.1π), cos(0.2π), . . . , cos(0.6π), and each has a probability 1/6.

C、The possible values of X (0.001) could be cos(0.2π), cos(0.4π), . . . , cos(l .2π)

D、The possible values of X (0.001) could be cos(0.1π), cos(0.2π), . . . , cos(0.6π)

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第4题

Two random processes X(t) and Y(t) arejointly wide-sense stationar, then

A、X(t) is stationary.

B、Y(t) is stationary.

C、Cross-corelation RXY(t1, t2) depends ony on r = t1 - t2

D、as long as both X(t) and Y(t) are individually stationary

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第5题

Assume that Z(t) = X(t) + Y(t), where X(t) and Y(t) are jointly stationary random processes.

A、Z(t) is a stationary process

B、Sz(f) = Sx(f) + Sy(f)

C、Sz(f) = Sx(f) + Sy(f) + Sxy(f) + Syx(f)

D、If the two processes X(t) and Y(t) are uncorelated and at least one of the processes is zero mean，then Sz(f) = Sx(f) + Sy(f)

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第6题

Which one of the following functions can be the autocorrelation function of a random process?

A、

B、

C、

D、

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第7题

We have proved that when the input to an LTI system is stationary, the output is also stationary. If we know that the output process is stationary, can we conclude that the input process is necessarily stationary?

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第8题

Considering the properties of the sine wave plus narrowband noise.

A、If the narrowband noise is Gaussian, the in-phase and quadrature components are jointly Gaussian.

B、Both the in-phase and quadrature component have the same variance.

C、Both the in-phase and quadrature component have the same mean.

D、The envelope and phase components are statistically independent.

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第9题

Thermal noise is a stationary, zero-mean Gaussian process.

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第10题

If two processes are statistically independent, they are orthogonal.

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