Resonance of surface waves of a given length is shown to be possible over bed waves with synchronous , subharmonic, or ultraharmonic wave lengths.

针定长入射流，得到一个自治动力，出它的次谐波振分叉图。

The error estimation of the quasi-synchronous sampling harmonics anal-ysis and the method used for measuring the subharmonics of periodic signalsare also discussed.

文中量误差作了分析和估计,并介绍了量分数次谐波的一种方法。