Land vehicle e sewage treatment plant: o que têm em comum

1. Passo 1. Land vehicle — inclui — Rail vehicle. Rail transport is land transport.
2. Passo 2. Rail vehicle — inclui — Refrigerator car. A railway car.
3. Passo 3. Refrigerator car — tem como parte — Compressor. A refrigeration unit.
4. Passo 4. Compressor — faz parte de — Sewage treatment plant. Blowers supply oxygen to the microbes.

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