Tuning fork stem e tank: o que têm em comum

1. Passo 1. Tuning fork stem — faz parte de — Tuning fork. A holder.
2. Passo 2. Tuning fork — faz parte de — Quartz clock. Quartz shaped like a tuning fork at 32,768 Hz.
3. Passo 3. Quartz clock — evoluiu de — Pendulum clock. Quartz replaced the pendulum as the frequency standard.
4. Passo 4. Pendulum clock — tem como parte — Gear. A wheel train.
5. Passo 5. Gear — faz parte de — Transmission (gearbox). A gearbox is a set of gears.
6. Passo 6. Transmission (gearbox) — faz parte de — Tank. The transmission carries torque to the drive sprockets and lets the tank turn.

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