What is the process of dehydrohalogenation

Dehydrogenation is a chemical unit process, which is the opposite of hydrogenation. It is a process of reducing the number of hydrogen atoms in organic molecules

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1. For dimming bulbs, Xiao Ming thinks that when the lamp is dark, it saves more power than when it is on, but Xiao Lin thinks that when the lamp is dark, the power of sliding rheostat increases, so it doesn't save power. Q: who is right? Briefly describe your reasons (Baidu has many different answers, Dashen must do it by himself!)
2. One in half, one in three, three in two, two in nine... Rule
3. What are their rules? What are the last two?
4. There is a series of numbers: one-half, one-half, two-thirds, one-third, two-thirds, three-thirds. According to this law, what is the number of the third column
5. Minus one times one half equals minus one plus one half. Why? It's due tomorrow!
6. Minus one times one half = minus one plus one half, and what you find is this rule
7. Negative two and a half times negative three and a third times negative one equals zero
8. Split term method (- 1000 and 2 / 3) - 999 and 5 / 6 - (- 2000 and 3 / 4) - 1 and 1 / 2
9. The set {1,1 / 2,1 / 3,1 / 4} is represented by description,
10. The set 1 / 2,2 / 3,3 / 4,4 / 5 is represented by description,
11. What do you mean by this idiom
12. What's the meaning of set description? How to explain his concept? Why to express it like this? {xix-3 > 2} what does each letter mean? I really don't know how to express in this way whether certain objects belong to certain conditions, what are certain conditions, and where are certain objects?
13. Which God simply explained the "sound value combination method", thank you
14. Quarter to x = half to one sixth how?
15. How to express half and one third
16. How many addition and subtraction formulas can be composed of any two numbers in 160720250? Write them down and calculate them
17. Use the five numbers half, one third, one fourth, one fifth and one sixth to form the formula of addition and subtraction and write the number
18. In 1 / 3 × 12, 12 × 1 / 3, 1 / 3 × 5 / 7, 4 / 3 × 0, 5 / 2 × 1, 1 / 3 × 1 / 2 In 1 / 3 × 12,12 × 1 / 3, 1 / 3 × 5 / 7, 4 / 3 × 0, 5 / 2 × 1, 1 / 3 × 1 / 2, the product of the maximum and the first factor () is equal to that of the first factor () and less than that of the first factor () is equal to that of the product ()
19. X - (2 / 7 + 3 / 7) = 4 / 7 + X + 1 / 2 = 15 / 8, 4 / 5 - x + 1 / 3 = 5 / 6
20. (3 / 4 minus 1 / 2) × (1 / 3 + 1 / 4) =? [to calculate the process]