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| perfectly elastic media | |||
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完全弹性 介 质 : 3 phrases in 2 subjects |
| Oil / petroleum | 2 |
| Technology | 1 |
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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