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Anonymous users2024-02-11Length: 1 km 1000 m.
1 meter 10 dm.
1 dm 10 cm.
1 cm 10 mm.
1 mm 1000 μm.
1 μm 1000 nm.
Area: 1 square kilometer, 100 hectares.
1 hectare 10,000 square meters.
1 square meter 100 square decimeters.
1 square decimeter 100 square centimeters.
1 square centimeter 100 square millimeters.
Volume 1 cubic meter 1000 cubic decimeters.
1 cubic decimeter 1000 cubic centimeters.
1 cubic centimeter 1000 cubic millimeters.
Volume 1 liter 1000 ml 1 cubic decimeter.
1 ml 1 cubic centimeter.
Mass 1 ton 1000 kg.
1 kg 10000 g 1 kg.
1 kg 2 catties pounds = Gu Si.
1 gram 10,000 mg.
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Anonymous users2024-02-101) Length measurement unit and advance rate: kilometers (kilometers), meters, decimeters, centimeters, millimeters.
1 km = l km.
1 km = 1000 m.
l m = lo decimeter.
1 decimeter = lo centimeter.
l cm: 10 mm.
2) Area measurement unit and rate: square kilometers, hectares, square meters, square decimeters, square centimeters.
1 square kilometre = 100 hectares.
l square kilometers = 1000 square meters.
l hectare = 10,000 square meters.
1 square meter = square decimeter.
1 square decimeter 100 square centimeters.
3) Volume volume measurement and advance rate: cubic meters, cubic decimeters, cubic centimeters, liters, milliliters.
l cubic meter = 1000 cubic decimeters.
1 cubic decimeter 1000 cubic centimeters.
l cubic decimeter = l liter.
1 cubic centimeter = l milliliter.
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Anonymous users2024-02-09Candlelight is a unit of luminous intensity, and lux is just a unit of luminous intensity per unit area, if there is a flashlight, the area of the aperture multiplied by the area corresponding to the lux is the lumens of this flashlight. As the torch moves, the aperture area becomes larger and smaller, and the lux changes as well, but their product is fixed, which is lumens. So that's why lumens are used to indicate the brightness of the flashlight.
Lux is just a concept of light "density". A candle has 4 lumens, and if this light is evenly concentrated on 1 square centimeter, the intensity is 125,600 lux; If evenly concentrated on 1 square meter, only a lux 220V 100W incandescent lamp emits a luminous flux equal to about 400 lumens. This translates to almost 1cd per 1W, so 50 candles is 50 watts.
In October 1979, the 16th International Conference on Weights and Measures defined candela (candlelight) as: a monochromatic radiation light source with a frequency of (yellow-green visible light), so the frequency of light with a wavelength of 555 nanometers, what is the frequency, the formula seems to be =v*t, =555*10 -9 meters, v=speed of light = 3 10 8m s
If you do the math, you get t, and the reciprocal of t is the frequency.
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Anonymous users2024-02-08The helper is powerful, this question is too profound.
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Anonymous users2024-02-07There is a reward for writing it, I like you, who do you think you are? How much money do you have?
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Anonymous users2024-02-06Why not use refractory cement?
The use of refractory cement is very simple, it can be hardened after adding water and mixing, and generally does not need to add other binders, and some refractory aggregates and powders can be added. If refractory cement is used alone, many cracks will occur after high temperatures. General refractory cement can withstand temperatures of about 1300 degrees.
Refractory cement can be used with ordinary sand, and the ratio of cement to sand is about 30%.
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Anonymous users2024-02-05The teacher rewarded us with studying hard.
Not "reward", but "encouragement".
It becomes: The teacher encourages us to study hard.
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Anonymous users2024-02-04The teacher encouraged us to study hard. If the words are misused, the reward will be changed to encouragement.
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