并对表面声道中起伏率随距离的变化作了数值计算。
The change of coefficient of variation with range in a surface sound channel was calculated numerically.
本文得到了在波导传播中的无方向性点源的平均声压、平均强度和声信号振幅的起伏率。
The mean pressure, mean intensity, and the coefficient of variation of amplitude of the signal propagated in wave-guide were obtained in this paper.
纽约股市在经历一个星期的震荡起伏后，今天以涨势收盘。星期五早晨美联储宣布降低贴现率是这次反弹的原因。
After a roller-coaster week, Wall Street closed up today. The rebound comes after the Fed cut its key discount rate a half percentage point Friday morning.
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