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| open-end group | |||
| open-ended class; open class; open class interval; open-ended class interval | |||
| open-end class; open group | |||
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开口 组 : 8 phrases in 7 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Earth sciences | 1 |
| Electric machinery | 1 |
| Electronics | 2 |
| Information technology | 1 |
| Mathematics | 1 |
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