[問題] 保溫便當盒/罐裝湯保溫效果?
想知道一般保溫便當罐 (圓柱型)/悶燒罐該怎麼分辨?
一樣都是內部材質不銹鋼,外部塑膠;
保溫效果是否依品牌會有差別?
一般若是早上8點裝熱湯(盛一半容量,裝前沒有用熱水燙過內部),
到中午時是否溫度就只剩近乎涼的溫口?
謝謝!
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