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| 单位氮英一般在草地施肥时，指施用纯氮量1 unit= 121b | |||
| 单位氮 | |||
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| 单位; 中子剂量单位 | |||
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units N : 4 phrases in 3 subjects |
| General | 1 |
| Space | 1 |
| Telecommunications | 2 |
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