Unverified80% confidenceFactTime unknown
电热饭盒不等于保温饭盒，多数机型断电后无真空保温层，保温时长有限（通常1-2小时明显降温）；如需长时间保温应额外看是否有真空结构，否则依赖到点加热而非保温
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80%
Confidence
Long-term
Relevance
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