There is a cylindrical fountain in the school. The diameter of the bottom of the fountain is 8 meters. It can hold 25.12 cubic meters of water at most. How deep is the fountain?

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• 1. There is a cylindrical fountain in a park. The bottom area of the fountain is 6m in diameter. It can hold 18.84 cubic meters at most. What is the depth of the fountain
• 2. The school builds a round fountain with a volume of 37.68 cubic meters and a diameter of 4 meters A. 2B. 3C. 0.6D. 5
• 3. The school builds a round fountain with a volume of 37.68 cubic meters and a diameter of 4 meters A. 2B. 3C. 0.6D. 5
• 4. A cylindrical spray tank, with an inner diameter of 8m, can hold up to 25.12m3 of water. How many meters deep is the tank?
• 5. Each circular landscape fountain in the park is 10 meters in diameter. There is a 12 meter wide path around the fountain. Can you calculate the area of the path?
• 6. A round fountain is 20 meters in diameter. Now we need to build a 1 meter road around the fountain. How many square meters does the road cover?
• 7. There is a circular fountain in the center of the seaside park with a radius of 4 meters. A 2-meter-wide path should be built around the fountain. How many square meters is the area of the path?
• 8. A circular fountain with a diameter of 8 meters is paved with a 1 meter wide path around it. How many square meters is the area of this path?
• 9. The perimeter of a circular fountain is 37.68 meters. How many square meters does the circular fountain cover?
• 10. How to calculate the 380V voltage divided into several 220V currents in the distribution box There is a distribution box on the second floor. The main power supply is led from the switch cabinet on the first floor. The air switch in the distribution box on the second floor is like this. The total air switch is ABC three-phase power, and N and PE are directly connected to the line, There are five 1p air switches in the distribution box for lighting, and the power is like this: the first air switch is 3500W, the second is 5000W, the third is 2500W, the fourth is 1000W, and the fifth is 2000W There are four two p air switches with leakage protection in the distribution box, which are used for sockets. The power is like this: the first is 2000W, the second is 1500, the third is 2600, and the fourth is 2400W There are also six 380V 3P air switches in the distribution box, two for air conditioning, both of which are 7 kW, What is the current of this distribution box, (please tell me the calculation method) how thick cable should I choose 2. Should I choose 3P air switch or moulded case circuit breaker for the general air switch of the distribution box on the second floor 3. Is the cable leading from the second floor to the first floor switchgear directly pressed on the copper bar in the switchgear, or is the cable led from the copper bar through the molded case circuit breaker and then pressed on the molded case circuit breaker? If it passes through the molded case circuit breaker, what size of the circuit breaker should I choose 4. What size of the total air switch in the distribution box on the second floor should I choose, the same as the rated current or twice the rated current
• 11. There is a circular fountain in a park. The perimeter of the fountain is 75.36 meters. What's its diameter?
• 12. Xianjing park has a circular fountain with a diameter of 12 meters. There is a circle of stainless steel guardrail 0.5 meters outside the fountain. How long is the guardrail at least?
• 13. Xianjing park has a circular fountain with a diameter of 12 meters. There is a circle of stainless steel guardrail 0.5 meters outside the fountain. What is the minimum length of the guardrail If you want to work out the formula, you have to say the truth
• 14. In the center of a primary school, there is a circular fountain with a diameter of 8 meters and a depth of 0.6 meters ① There are 10 cone-shaped stones in the fountain to install the nozzle. The bottom radius of each stone is 3 decimeters and the height is 4 decimeters. Please calculate the space occupied by these stones ② To make the nozzle spray water normally, it is necessary to put 0.5m deep water into the pool. What is the volume of water? ③ If you want to build a 1 meter wide circular road on the edge of the pool, how many square meters is the area of this road?
• 15. Street garden to build a cylindrical fountain, the bottom diameter is 10 meters, 1 meter deep, in the fountain bottom and inner wall plastered with cement, plastering cement part of the area is
• 16. Star square has designed a cylindrical fountain with a bottom diameter of 40 meters and a depth of 1 meter. (1) if tiles are laid around and at the bottom of the fountain, how many square meters of tiles are needed? If every liter of water weighs 1kg, how many tons can the pool hold?
• 17. The diameter of the bottom of a circular fountain is 8 meters. How many cubic meters of circular concrete are built along the periphery of the fountain, which is 1 meter wide and 20 cm thick? Urgent, as the title
• 18. Square to build a cylindrical shape of the pool, the pool wall and bottom to paste tiles. Pool bottom diameter 28 meters, pool depth 1.2 meters, paste the area of how many square meters?
• 19. To build a cylindrical fountain pool in the public square, porcelain weights should be pasted on the wall and bottom of the pool. The diameter of the pool bottom is 28 meters, and the depth of the pool is 1.2 meters. What is the area of tile
• 20. To build a cylindrical fountain pool in the public square, tiles should be pasted on the wall and bottom of the pool. The diameter of the pool bottom is 30 meters and the depth of the pool is 1.2 meters. What is the area of tiles