1. 13
3. − 90
5. 0
7. − 40
9. 120
11. 22
13. 57
15. − 13
17. − 36
19. 0
21. x = − 1 , y = 0 , z = 2 , t = 1
23. x = 1 , y = 2 , z = − 1 , t = 3
25. x = 2 , y = − 1 , z = − 1 , t = 3
27. D = 1 , E = 2 , F = − 1 , G = − 2
29. 0
31. 8
33. 3316A , 118A , − 58A , − 158A , − 1516A
35. 20.8 km2
37. ppm SO2 : 0.5, NO: 0.3, NO2 : 0.2, CO: 5.0
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