| 摘要 |
A thermos consists of a body, a cap and a heating device. The body has an inner wall, an outer wall and a bottle opening, where an intermediate space is formed between the inner and outer walls. The cap is fitted to the bottle opening. The heating device contains an induction coil, a donut magnet and a resistance heater. The induction coil is wound in the inner wall. The donut magnet is placed in the intermediate space and it can move freely within the intermediate space. The resistance heater is electrically connected to the induction coil and touches the inner wall.
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