Selectivity: When the query optimizer (QO) studies your SQL, the degree of selectivity determines if an index should be used to perform the operation.
选择性：当查询优化器(query optimizer，即QO)读取SQL时，选择性的程度决定了索引是否应该用来执行该操作。
About the angular selectivity, the changing trends for different polarizations are the same, but with different degree of variations.
对于角度响应，两种偏振态有相同的变化趋势，但变化量不同。
FM radio has the advantages of high sensitivity, stable work, good selectivity and low degree of distortion etc... With high technology content and high quality has been widely welcomed.
调频收音机具有灵敏度高、工作稳定、选择性好及失真度小等优点。以较高的技术含量和较高的音质得到了广泛的欢迎。
FM radio has the advantages of high sensitivity, stable work, good selectivity and low degree of distortion etc... With high technology content and high quality has been widely welcomed.
调频收音机具有灵敏度高、工作稳定、选择性好及失真度小等优点。以较高的技术含量和较高的音质得到了广泛的欢迎。
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