Alto-forno e modem: o que têm em comum

1. Passo 1. Alto-forno — utiliza — Coque. The fuel and reducing agent is coke (formerly charcoal).
2. Passo 2. Coque — é feito de — Carbono. Coke is almost pure carbon: everything else is baked out of the coal.
3. Passo 3. Carbono — é material para — Hearing aid. The first hearing aids used a carbon microphone.
4. Passo 4. Hearing aid — evoluiu de — Telephone. The first electric hearing aids were built from telephone components.
5. Passo 5. Telephone — é utilizado em — Modem. It works over a telephone line.

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