A kind of pollen has a diameter of 20 microns, which is equivalent to -- by scientific notation

2 * 10 ^ - 5m

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1. The diameter of one kind of pollen is about 35 microns, and the diameter of this kind of pollen is about 10 microns______ Rice
2. The diameter of a certain kind of pollen is about 40 microns. How many pollen grains can be connected up to 1 meter?
3. The cell diameter of higher animals and plants is 20 to 30 μ m, 1 μ M = 10 ^ - 6 m, which is equivalent to () to () m in scientific notation
4. The average distance between the earth and the sun is 149.6 million kilometers______ It is necessary to keep one decimal place with "rounding method"______ 100 million kilometers
5. The distance between the earth and the sun is 149.6 million kilometers, and the average distance between the earth and the moon is 384400 kilometers. How many times is the distance between the sun and the earth
6. How many meters is one millionth? How to express it by scientific counting?
7. The stack of books in a library is about 7000 meters, one millionth of which is expressed as meters by scientific counting
8. What's 75 percent in scientific notation
9. 1854.79 billion yuan = billion yuan = billion yuan in scientific notation
10. 2.175 billion is represented by scientific counting
11. The diameter of a plant cell is 0.00000275 m, which is expressed as______ Rice
12. The diameter of influenza virus is 0.00000008 m, which is expressed as______ m．
13. The diameter of a bacterium is 0.000015m, which is expressed as______ Rice
14. The diameter of a nanoparticle is 0.000 & nbsp; 000 & nbsp; 035m, which is expressed as ⊙ by scientific notation___ Rice
15. Expressed by scientific counting method: 20041003=
16. Expressed by scientific counting method - 13500000
17. Expressed by scientific counting 13651.5 billion yuan, in Yuan as a unit, expressed by scientific counting method, retaining four significant figures
18. How to express 1500 by scientific counting
19. It is known that the diameter of a certain pollen is 25 μ m, 1 μ M = 10-6 cubic meters. How many pollen can be arranged into 1 meter
20. The pollen diameter of chrysanthemum, peach and plum is about 50um, 30um and 20um respectively. Please use scientific counting method to show how many meters each of them is equivalent to?