From the inside, the cuboid box with the edge length () has a volume of 1 cubic decimeter, which can hold（ Measured from the inside, the cube box with edge length () has a volume of 1 cubic decimeter, which can hold () water

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• 1. How to prepare 75% ethanol? I don't know if 75% is volume fraction or mass fraction
• 2. Who knows how 75% alcohol becomes anhydrous ethanol? Why?
• 3. Now there is 98% ethanol, how to prepare 75% ethanol
• 4. How to make 75% ethanol from 95% ethanol
• 5. High school biological reagents, such as alcohol, say different concentrations in their respective experiments, 3Q ~!
• 6. The purpose of each concentration of alcohol,
• 7. The following is about the application of alcohol in biological experiments A. In the experiment of using Sudan III to identify fat, the role of alcohol is to wash off the floating color on the experimental materials. B. absolute alcohol plays the role of separating pigment in the experiment of pigment extraction and separation. C. when making onion root tip cell mitotic chip, the components of dissociation solution are hydrochloric acid and alcohol D In the experiment of observing the distribution of DNA and RNA in cells, alcohol can be used to change the permeability of cell membrane and accelerate the dye entering into cells
• 8. What's the difference between the effect of alcohol in the test of fat in biological tissue and the observation of mitosis in plant cells~
• 9. Put the leaves of plants in alcohol to heat. What is the function of alcohol? Photosynthesis experiment Understand the answer I did not give, not to
• 10. In senior high school biology experiment, alcohol and hydrochloric acid play an important role in the whole process,
• 11. How many cubes can be placed in a box with a volume of 1 cubic meter
• 12. A drink bottle can hold up to 1.25 kg of water, then the volume of the bottle is () cubic decimeter
• 13. The volume of a 20 liter tank A. is equal to 20 cubic decimeters B. larger than 20 cubic decimeters C. smaller than 20 cubic decimeters
• 14. The volume of a conical container is 9.42 cubic decimeter, and the bottom radius is 1 decimeter
• 15. A cylindrical container with a volume of 3 cubic decimeters is placed on a horizontal table. The container contains 1 kg of water. Now, a container with a density of 0.6 g per cubic meter A cylindrical container with a volume of 3 cubic decimeters is placed on a horizontal table. The container contains 1 kg of water. Now put a wood block with a density of 0.6 g / cm3 into the container. The wood block does not touch the wall of the container. The water is just full but does not overflow. What is the mass of the wood block?
• 16. A container with a volume of 20 cubic decimeters and a mass of 4 kg is used to calculate the total mass when it is filled with water As the title
• 17. The volume of a container is 60 cubic decimeter, its volume () 60 cubic decimeter multiple choice questions a is equal to B is greater than C is less than
• 18. A cylindrical container can hold 2 cubic decimeters of water, we say its volume is 2 cubic decimeters, right and wrong
• 19. Which objects are to be found in one cubic centimeter, one cubic decimeter and one cubic meter The more, the better
• 20. Which objects are measured in cubic meters, decimeters, cubic centimeters