In the study of flow oscillation and discrete frequency noise of impinging jet, it is found that there is a critical pressure ratio for a given nozzle and a nozzle-to-plate distance.
为探索冲击射流离散频率噪声的产生机理，系统地研究了冲击射流离散频率噪声的特性。
The relationship between equilibrium of passenger flow and some factors, such as the length of routes, average travelling distance and load ratio, are considered in the selection of operation indices.
在运营指标的选取中，主要考虑了线路长度、平均运距和满载率等因素与客流均衡性的关系。
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