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To identify the quality of the thermos bottle, take the bladder out of the bottle shell to see if the glass tail tube (shaped like a teat) under the bottle is damaged. If it is broken, it means that the air has entered the middle of the two layers of glass and it is impossible to keep the heat preservation.
The invention of papermaking. In 105 AD, Cai Lun summed up the experience of his predecessors in Luoyang, the capital of the Eastern Han Dynasty, and improved the papermaking technique, using bark, hemp head, rags, old fishing nets, etc. as raw materials to make paper.
The leakage protection function of the electromagnetic heater control box should be tested at least several times a month.
Pour boiling water into the thermos cup and tighten the cork or lid clockwise for 2-3 minutes, then touch the outer surface of the cup body with your hands.
Bento has existed since ancient times, and in modern society, it is more common due to the continuous growth of office workers. A delicious and nutritious bento can not only supplement the body's needs, but also make the mood happy.
What is a good dish to bring for lunch? 3 dishes that are suitable for lunch boxes, not easy to spoil and nutritious!