R20
R20、R.20或R-20可以指：
- 台鐵R20型柴電機車
- 1号电池，别名IEC R20
- snoR20，核仁小核糖核酸R20
- 氯仿，别名氟利昂-20、R-20
- 警示性質標準詞列表R20：吸入有害
- ICD-10 第十八章：症状、体征和临床与实验室异常所见R20 皮肤触觉障碍
| Q20 | ||
| R19 | R20 | R21 |
| S20 | ||
| R20 | - | 20R |
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