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How to introduce wires and cables in English?
Wires and cables refer to wire products used to transmit electrical energy information and achieve electromagnetic energy conversion.. Wire: Generally, products with only metal conductors and insulated wires with lightweight protection (such as cotton yarn weaving layer, glass fiber weaving layer, plastic, rubber, etc.), simple structure, relatively small outer diameter, and low voltage and current usage are called wires. Cable: A product that has both conductors and insulation layers, sometimes with a rigorous inner protective layer to prevent moisture intrusion, or an outer protective layer with high mechanical strength, with a complex structure and a large cross-sectional area, is called a cable. Wires and cables refer to wire products used to transmit electrical energy information and achieve electromagnetic energy conversion. Wire: Generally, products with only metal conductors and insulated wires with lightweight protection (such as cotton yarn weaving layer, glass fiber weaving layer, plastic, rubber, etc.), simple structure, relatively small outer diameter, and low voltage and current usage are called wires. Cable: A product that has both conductors and insulation layers, sometimes with a rigorous inner protective layer to prevent moisture intrusion, or an outer protective layer with high mechanical strength, with a complex structure and a large cross-sectional area, is called a cable. Wire,cablemeansfortransmittingelectromagneticenergyinformationandachieveenergyconversionwireproducts.Wire:usuallyonlythemetalconductorproductsandontheconductorcoatedwithaninsulatinglayertoprotecttheappliedlight(suchascottonbraid,braidglass,plastic,rubber,etc.),thestruct
2. Solve several English chemistry problems
1) hc/λ>383 × 10 ^ 3/NAh: Planck constant 6.63 × 10 ^ -34J · s, c: speed of light 3 × 10 ^ 8m/s, λ: photon wavelength, NA: Avogadro constant 6.02 × 10 ^ 23. The wavelength obtained is<3.13 × 10 ^ -7m, which is 313nm2. This means that microwave heating requires water molecules. If there is no water but a metal, it will reflect microwaves and damage the microwave oven. A 3.22mm microwave photon with an energy of E=hc/λ=6.18 × 10 ^ -23J122g needs 122 * 315=38430J to heat water from 25 ℃ to 100 ℃. The minimum number of microwave photons required is 38430/6.18 × 10 ^ -23=6.22 × 10 ^ 26. According to the de Broglie wavelength formula, λ=h/mv=6.63 × 10 ^ -34/(9.11 × 10 ^ -31 * 9.2 × 10 ^ 5)=7.94 × 10 ^ -10m=0.794nm. In the formula, m: electron mass 9.11 × 10 ^ -31kg, v: electron velocity, h: Planck constant. According to Einsteins photon theory, E=hc/λ, calculate λ=7.03. x 10 ^ -11m=0.07nm5) F - (is it a fluoride ion?) The number of unpaired electrons is 0, which means all electrons are paired.
3. Write in English how water circulates
water exists in three different states, solid, liquid and gas, the solid water is ice, liquid is the normal state, vapor is the water in gas.water always transfers in these states , vapor comes from ice or water, when it meets coldness, it forms little drop of water, with air"s convection, it turn