MOST stomach ulcers are mainly caused by _________.(30 points)
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| 1 | 9 8 7 |
0.058067 seconds
| 2 | 18 17 16 |
0.0565690000000001 seconds
| 3 | 4 3 2 |
0.124165 seconds
| 4 | 18 17 16 |
0.052032 seconds
| 5 | 11 10 9 |
0.046343 seconds
| 6 | 13 12 11 |
0.046398 seconds
| 7 | 19 18 17 |
0.135039 seconds
| 8 | 5 4 3 |
0.050485 seconds
| 9 | 24 23 22 |
0.043825 seconds
| 10 | 10 9 8 |
0.048637 seconds
| 11 | 7 6 5 |
0.677966 seconds
| 12 | 7 6 5 |
0.051597 seconds
| 13 | 5 4 3 |
0.048961 seconds
| 14 | 5 4 3 |
0.045355 seconds
| 15 | 5 4 3 |
0.050629 seconds
| 16 | 4 3 2 |
0.126753 seconds
| 17 | 3 2 1 |
0.045626 seconds
| 18 | 3 2 1 |
0.047668 seconds
| 19 | 3 2 1 |
0.039592 seconds
| 20 | 3 2 1 |
0.117495 seconds
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