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How is the sound signal saved in the digital circuit？

答案

The compact disk player is an example of a system in which both digital and analog circuits are used． Music in digital form is stored on the compact disk． A laser diode optical system picks up the digital data from the rotating disk and transfers it to the digital-to-analog converter．

发布时间：2021-10-23

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According to the model, what normally signals the disappearance of an El Nino?

A．The arrival in the eastern Pacific of negative sea-level Kelvin waves.

B．An increase in the speed at which negative Rossby waves cross the Pacific.

C．A shift in the direction of the winds produced by the start of an anti-El Nino elsewhere in the Pacific.

D．The reflection of Kelvin waves after they reach the eastern boundary of the Pacific, along Ecuador and Peru.

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第2题

Which one of the following is the safety signal ().

A.SSS

B.TTT

C.XXX

D.FFF

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第3题

The satellite television signal is transmitted in the digital video format of______.

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第4题

A vessel not under command sounds the same fog signal as a vessel ______.

A.engaged in towing

B.constrained by her draft

C.under sail

D.All of the above

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第5题

Whichofthefollowingistheprimarypurposeofimpedancematchedvolumecontrol？（）

A.Maintainsproperspeakerphase

B.Protectstheamplifierfromdamage

C.Protectsthedigitalsystemsfromdamage

D.Amplifiesthespeakersignal

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第6题

______ is the most visible signal of distress from a lifeboat at sea in the daytim

A.Smoke signal

B.Flash signal

C.Fire signal

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第7题

________is the most visible signal of distress from a lifeboat at sea in the daytime.

A.Smoke signal

B.Flash signal

C.Fire signal

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第8题

In line l0．when the author states that the owners“anxiously watch the sky”，there is the implication that the owners__________ ．

A.want their pigeons to win the race

B.are sending radar signals to their pigeons

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第9题

In line l0．when the author states that the owners“anxiously watch the sky”，there is the implication that the owners__________ ．查看材料

A.want their pigeons to win the race

B.are sending radar signals to their pigeons

C.do not know whether the race began on time

D.do not trust the rules set down by the judges

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