Peace chain virtual currency

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3. I haven't seen this monetary fund platform before. Do you listen to what others say? You need to examine it more

4. (1) The key step of genetic engineering is the construction of gene expression vector. < br > (2) the most effective way to transfer the target gene (spinach gene) into animal cells is microinjection. < br > (3) the chemical essence of FAD2 is protein, (4) gene transfer between plants and animals was successful, The results show that genetic engineering can overcome the barriers of distant hybridization incompatibility. < br > (1) construction of gene expression vector < br > (2) microinjection method < br > (3) antibody antigen hybridization < br > (4) overcoming the barriers of distant hybridization incompatibility

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6. Hello, it indicates that there is a problem with the vehicle. It's better to call the rescue and drag the vehicle to the maintenance station for inspection.

7. Just now, the answer is not what you asked. Delete
I found such a passage on the Internet. Do you think it's useful, High credibility
suction f ∝ BG * BG * s
the suction depends on the magnetic flux density of the magnetic circuit gap formed by the magnet and the absorbed material, and the cross-sectional area of the suction surface
BG mainly depends on the energy stored in the magnet itself and the design of the magnetic circuit (the soft iron can be used to concentrate the magnetism, so that BG is greater than the remanence of the magnet itself).
the energy stored in the magnet depends on the maximum magnetic energy proct (unit volume) of the magnet The magnetic circuit design is very important because the suction is proportional to the square of BG http://bbs.big-bit.com/dispbbs.asp?boardid=116&id=6383
look at the above post again. I don't understand it. I hope it will be helpful to your research

8. Attractive force F = B2 (2 is square) a / 2U (n)
where B is the flux density; A is the cross-sectional area of the core; U is the permeability. It can be calculated by function calculator

9. Of course, you need to know the magnetic properties of the magnet you are using before you can use it for calculation. Of course, you also need to know the volume and force area of the magnet.
if you have a magnet of a specific size and an iron ball of a specific size, you can also use a similar tensile test method

10. If a child knows anything, just tell him to pull, which is related to area, distance, magnetic field strength, etc.
if you calculate the force, you can connect a spring scale