Construction of trapezoidal channel as a part of temporary drain at zone f 于f区建造梯形渠作为部份临时排水系统
The ionosphere f region is one of the most important region in the ionosphere . the night - time irregularities in this region can affect nearly all - frequency radio waves propagation through them 电离层f区是电离层最主要的区域,尤其是其中的不规则结构,导致几乎所有波段的电磁波产生幅度和相位的闪烁。
The study results support the treatment of reducing lunathyrium ningshenense to the synonymy of d . coreanum . they reveal that dryoathyrium erecta should be athyriopsis erecta ( similar to the outcome of molecular tree ) 2 、分子系统学研究本文首次将叶绿体dna伽l一f区序列分析,用于蔗类植物的研究,同时对引物进行了筛选。
Ionospheric scintillation can be observated frequently in low - latitude of china , so it is very important to know the physical mechanism of night - time f region plasma instability and irregularities in it 我国的低纬地区属于电离层闪烁频繁发生的区域,研究电离层f区中不规则结构的产生、演化、形态及分布规律、对电波的影响等具有很重要的意义。