Are hydropower and wind power both mechanical energy to electrical energy?

Yes! Hydropower and wind power are both examples of mechanical energy to electric energy

At present, China's power supply is still in short supply, and various resources need to be developed to develop the power industry
17. There are 11 kinds of essential constant elements in human body, among which ()
A. Calcium B. iron C. potassium D. iodine
22. The following statement is wrong ()
A. Organic synthetic materials are polymer materials. B. cotton, wool and polyethylene are synthetic materials
B. Burning polyethylene plastics will cause environmental pollution D. used plastics and rubber should be recycled
23. Xiao Ou put some water in the boat and heated it with alcohol lamp. The boat was safe. The reason why the boat didn't burn was ()
A. It's not combustible. B. It's not in contact with oxygen. C. It doesn't reach the ignition point. D. water can extinguish the fire
25. When burning firewood, the firewood is usually overhead in order to burn more vigorously. This is because ()
A. The speed of heat dissipation is accelerated. B. the accumulated heat is increased
C. The ignition point of firewood decreased D. the contact area between firewood and air increased
28. The correct of the following statement is ()
A. When you enter a coal mine, you should do the lighting experiment first
B. As long as the chimney is built higher, the environmental pollution caused by coal smoke can be avoided
C. "White pollution" refers to plastic waste which is difficult to degrade
D. "Green food" generally refers to green food
29. When burning firewood, the firewood is usually overhead in order to burn more vigorously. This is because ()
A. The speed of heat dissipation is accelerated. B. the accumulated heat is increased
C. The ignition point of firewood decreased D. the contact area between firewood and air increased

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