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Anonymous users2024-01-24(1) Stainless steel belongs to the alloy of iron and belongs to metal materials
Plastics and plastics belong to organic synthetic polymer materials, so fill in: AE
2) There are six main categories of nutrients in the composition of food, and the nutrients not covered in the above table are water
The main role of sugar in the human body is to provide energy for human life activities
The human body needs vitamins and inorganic salts for vital activities, but the more the better, and it is necessary to maintain a relative balance Therefore, fill in: D
3) Coal, oil, and natural gas belong to fossil fuels
The main component of natural gas is methane, and the chemical equation for the formation of carbon dioxide and hydrogen by methane and water vapor at high temperatures is: CH4 + 2H2O high temperature
CO2 +4H2 ．
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