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| 能级间隔; 水平间距; 电平间隔 | |||
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level spacing : 6 phrases in 2 subjects |
| Construction | 1 |
| Technology | 5 |
The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Add | The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Report an error
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