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| loop test; ringing test; round-robin test | |||
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| ring test | |||
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环形试验 : 15 phrases in 8 subjects |
| Air defense | 1 |
| Automobiles | 1 |
| Chemistry | 1 |
| Engineering geology | 1 |
| Metallurgy | 1 |
| Nursing | 1 |
| Plastics | 1 |
| Technology | 8 |
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