The basic characteristics of the primary social justness and security system are low level, broad coverage and effectiveness.
初级社会公平保障体系的基本特征是低水准、广覆盖、有实效。
The wavefront corrector is one of the key elements of AO system. And improvement of the spatial correction capability of correctors is the primary coverage of AO theory and experiment research.
波前校正器是自适应光学系统中的核心部件，如何提高波前校正器的空间校正能力是自适应光学理论和实验研究的重要内容之一。
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