Based on production practice, provide the methods of controlling the compound roof.
通过生产实践，在复合顶板的管理方面提出了行之有效的几点做法。
This early polyphony is based on three simple and three compound intervals.
这种早期的复调音乐建立在三个简单和三个复合的音程的基础之上。
This early polyphony is based on three simple and three compound intervals.
这种早期的复调音乐建立在三个简单和三个复合的音程的基础之上。
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