这个质子活动区的主要形态特点是前导大黑子A的半影纤维的顺时针旋涡结构。
The main morphological feature of this proton active region is the clockwise spiral structure of the penumbral filaments of the large preceding spot "A".
本课程的前导课程为数据结构、程序设计、离散数学、数据库系统原理，学生必须掌握基本的数据库基本操作技术和方法。
The course prerequisites are Data Structure, Programmer, Discrete Mathematica, Database Concept etc. And acquire some knowledge of the database operating and programming.
算法基于一个特定图案的前导字，采用前向结构直接、同时估计各个同步参数。
The algorithm is based on the use of a special preamble, which allows the reference parameters to be estimated quickly, directly and simultaneously.
算法基于一个特定图案的前导字，采用前向结构直接、同时估计各个同步参数。
The algorithm is based on the use of a special preamble, which allows the reference parameters to be estimated quickly, directly and simultaneously.
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