the lager the initial radius in bubble inflation， the longer the vibrating period， and the lower the vibrating frequency.
气泡膨胀的初始半径越大其振动周期越大，频率越小。
The operating period prediction of rotary kiln in cement plant is very important to production management.
水泥窑运转周期预测对水泥厂生产管理具有重要意义。
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