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What do the numbers "1-7" on the bottom of plastic bottles represent? What are the notes about these signs?
Mark 1, 2, 3, 4, 5 is the safest: Mark 1: used to make mineral water bottle, drink bottle, can withstand 70 ℃ high temperature. Most of them are disposable products. Mark 2: used to make medicine bottle, food bag, can withstand 110 ℃ high temperature. Mark 4: used to make
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- 1. What do the numbers 1 to 7 at the bottom of a plastic bottle mean
- 2. What does the number 7 in the triangle at the bottom of a plastic bottle mean? Is it safe?
- 3. What do the numbers on the bottom of a plastic bottle mean?
- 4. From the beginning, what is the number of the thousandth four
- 5. "*" represents a new operation, its meaning is a * b = - A * B - (a + b), then what is the result of (- 3) * - 5
- 6. *A * b = - ab - (a + b) for (- 3) * 5 (- 4) * - 5 Use it quickly
- 7. "A" denotes a new operation. Its meaning is: a B = (- a) · B - (a + b). Find (3 a 4) a 5
- 8. A new operation is defined, which requires a * b = (a + b) + [a + (- b)] to find the value of 3 * (- 5)
- 9. "*" represents a new operation, its meaning is a * b = - A * B - (a + b). Find: (1) 3 * 5; (2) (- 3) * - 5
- 10. 8 * 1 / 4 and 1 / 4 * 8 are calculated in the same way and have the same meaning
- 11. What does the number 7 stand for and what does it mean?
- 12. What do the numbers 9, 7 and 3 mean in life or culture?
- 13. What does the number seven stand for? Good side
- 14. 23:0.52: two thirds: 203.7:
- 15. The special meaning of the number seven Various meanings
- 16. The meaning of the number "7" The more complete the better!
- 17. What's the special meaning of the number 7?
- 18. What do number pairs (3,2) and (2,3) represent respectively
- 19. -The meaning of each number of (+ 2) - (2.7) - (- 3)
- 20. What are the meanings of the two numbers in the number pair?