Based on observation data in the basin,the stage design flood at the dam site is calculated by area interpolation method,compared with the maximal value of design flood,and the quantitative relations between them are also worked out by introducing the conception of combined frequency.

This paper investigates various combined frequency interference in integrated and double-converted transceivers, and points out that the reason is the non-linearity of frequency mixer and amplifier.

In order to do a good work on flood control works and to seek for a better calculation method, this paper describes the theory and its application of frequency combination method and compares it with the traditionally used method via the practical examples.

【Conclusion】 These results not only have provided evidences for the true existence of genes controlling recombination frequency, but also facilitate our further research on map-based gene cloning and molecular breeding.

Both the type frequency and the token frequency of phonetic component showed facilitating effect in character naming.

Effects of type frequency and token frequency on Chinese character recognition were explored in two experiments.