(2) Animal food and bean products are rich in protein, and vegetables and fruits are rich in vitamins, so they are rich in beef slices, fish fillets, tofu and fresh duck blood from protein.
(3) Trace elements are closely related to human health. Iron is a component of hemoglobin, and iron deficiency can lead to anemia. Fresh duck blood contains trace element iron, which can be used to prevent anemia.
(4) The pot body of the hot pot is made of copper alloy, which mainly uses its thermal conductivity.
(5) According to the sufficient conditions of combustion and the temperature of the flame, the outer flame of the flame should be used when burning, and the temperature of the outer flame is high, and combustible substances should be fully contacted with air when burning.
So the answer is: (1)C2H5OH+3O2? Light it? . ? 2co 2+3H2O；
(2) Beef slices (or fish fillets, tofu and fresh duck blood); (3) iron deficiency anemia; (4) Thermal conductivity;
(5) heating the outer flame of the flame to increase the full contact area between solid alcohol and air;