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The

purpose of using a "door opener" in communication is to -----.

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Un amplificateur en boucle fermé a une bande passante de 19kHz pour une contre réaction égale à 0,023.  Son gain en boucle ouverte est de 80dB. Quel est son produit gain-bande?

Attention à l'unité !

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Who's

calling, please? Sorry, I didn't ---- your name.

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Чому дорівнює зусилля в позначеному стержні ферми (кН)?

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L'incertitude sur l'amplification d'un amplificateur est de 5% en boucle ouverte et de 0,2% en boucle fermée pour une contre réaction égale à 0,0004.

Quel est son gain en dB en boucle ouverte ?

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Calculer l'amplification du montage ci-dessous pour RA=6kΩ et RB=3kΩ et en considérant l'AOP idéal sauf pour son gain boucle ouverte supposé égal à 40dB.

gain fini 2

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Чому дорівнює зусилля в позначеному стержні ферми (кН)?

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Чому дорівнює зусилля в позначеному стержні ферми (кН)?

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Reading

The Storyteller

It was a hot afternoon, and the

hour-long train journey had just begun. There were five people in the railway

carriage- two young girls and their brother, sitting with their aunt, and a

young man, who was sitting in the corner. The young man had already begun to

think he'd chosen the wrong carriage to sit in.

The children were hot, tired and

bored, and behaving badly. The youngest girl was singing the first line of a

song, over and over again. Everything the aunt said began with, 'Don't!' and

everything the children said began with 'Why?'

"Don't put your feet on the seat,

Cyril!"

Why not?

Because you will make it dirty, and

don't stare at the man. Oh, look at those sheep in the field.

Nearly every field the train had

travelled past had had sheep in it, so the aunt's surprise was difficult to

explain.

Why is that man taking the sheep into

the other field? asked the younger girl.

'Perhaps there's more grass in that

field,’ replied the aunt. But there's lots of grass in both fields.

Well, perhaps the grass is better in

the other field.

 

Q

The kinds of questions that the children asked about

the grass and the sheep show that ---- .

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Залежно від сфери походження виділяють:

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