Solder e modem: o que têm em comum

1. Passo 1. Solder — é utilizado em — Printed circuit board. Components are soldered on.
2. Passo 2. Printed circuit board — faz parte de — Mobile phone. All of a phone's parts are soldered onto a printed circuit board.
3. Passo 3. Mobile phone — evoluiu de — Telephone. A mobile phone keeps the function of a telephone, replacing the wire with a radio channel.
4. Passo 4. Telephone — é utilizado em — Modem. It works over a telephone line.

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